Changing Library syntax??

I have been learning a lot while building my latest Arduino project and asking lots of questions that you guys smarter than I have been so gracious to answer.  Now I have another...

Is there a listing of the syntax that is used with a particular Arduino Library? Specifically I am looking for the code that works with the latest version of the Adafruit_MLX90614.h library.  My project utilizes two MLX90614 IR Temp sensors and I have successfully changed the I2C address of one of them to get both to work on my project. However, I changed the digital pin I am using for an indicator LED to another pin that was available. This is simply a PinMode line followed by a DigitalWrite line to turn on that LED.  I simply changed from one pin to a different one. When I went to upload the sketch to my project, I get an error regarding the AddrSet line.  A week ago I noticed that the Adafruit library was updated, but why did this line work before, but now it doesn't? I have looked on the Adafruit site and elsewhere and I can not find any information on what I have wrong or what would have changed.  Any ideas?

#include "Wire.h"
#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_SSD1351.h"
#include "Adafruit_MLX90614.h" //modified sensor library for multiple MLX sensors

//screen dimensions
#define SCREEN_WIDTH 128 //pixel width
#define SCREEN_HEIGHT 128 //pixel height

//pin definitions
#define SCLK_PIN 7 //defines s clock pin
#define MOSI_PIN 11 //defines master-out slave-in SDA pin
#define RST_PIN 3 //defines reset pin
#define DC_PIN 5 //defines master-in slave-out pin
#define CS_PIN 4 //defines chip select pin

//color definitions
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
#define GREY 0x8410
#define ORANGE 0xE880

Adafruit_SSD1351 display=Adafruit_SSD1351(SCREEN_WIDTH, SCREEN_HEIGHT, &SPI, CS_PIN, DC_PIN, RST_PIN);

//IR sensor setup
#define IR1 0x5A
#define IR2 0x5B
Adafruit_MLX90614 mlx;

//code for voltage test

#define ANALOG_IN_PIN A0 //analog input pin
float adc_voltage = 0.0; //float for ADC voltage
float in_voltage = 0.0; //float for input voltage
float R1 = 30000.0; //floats for resistor values in divider
float R2 = 7500.0;
float ref_voltage = 4.096; //float for reference voltage
float adc_value = 0; //float for ADC value

void setup() {
// put your setup code here, to run once:

// Power ON indicator
pinMode(8,OUTPUT);
digitalWrite(8,HIGH);

//start I2C bus
Wire.begin();

//start IR sensors
mlx.begin();

// Use external voltage reference
analogReference(EXTERNAL);

//set up initial screen elements
display.begin();
display.fillScreen(BLACK);
display.setTextColor(ORANGE);
display.setTextSize(1);
display.setCursor(25,0);
display.print("SYSTEM STATUS");
display.setTextSize(1);
display.setCursor(0,20);
display.setTextColor(BLUE);
display.print("INPUT VOLTAGE:");
display.setCursor(0,33);
display.setTextColor(BLUE);
display.print("VXi TEMP RIGHT:");
display.setCursor(0,46);
display.setTextColor(BLUE);
display.print("VXi TEMP LEFT:");

}

void loop() {
// put your main code here, to run repeatedly:

//Read analog voltage input
adc_value = analogRead(ANALOG_IN_PIN);

//Determine voltage at ADC input
adc_voltage = (adc_value * ref_voltage)/1024.0;

//Calculate voltage at divider input
in_voltage = adc_voltage / (R2/(R1+R2));
String VoltNew = String(in_voltage,2);

//Draw black rectangle over voltage display to clear numbers
display.drawRect(88,20,40,10,BLACK);
display.fillRect(88,20,40,10,BLACK);

// Send voltage results to screen
display.setCursor(88,20);
display.setTextColor(WHITE);
display.print(VoltNew);
delay(1000);

//read IR sensor
mlx.AddrSet(IR1);

//Draw black rectangle over left temp display to clear numbers
display.drawRect(91,33,40,10,BLACK);
display.fillRect(91,33,40,10,BLACK);

// Send Right amp temp results to screen
display.setCursor(91,33);
display.setTextColor(WHITE);
display.print(mlx.readObjectTempF());
mlx.temp1 = mlx.readObjectTempF();
delay(100);

//read IR sensor
mlx.AddrSet(IR2);

In function 'void loop()':
Colorado:115:9: error: 'class Adafruit_MLX90614' has no member named 'AddrSet'
mlx.AddrSet(IR2);