Script Issue

Hi all! I've been trying to change my FOV for my main camera when the sprinting function is true, but I've been getting errors. I'm new to coding so if anyone can give me any advice to correct these errors that would be awesome! Here is the script and the list of errors: static var bobbingSpeed; static var bobbingAmount; static var playerStamina = 600;

 static var audioStepLength: float = 0.5;
 static var stepSound = 0;
 
 var walkSpeed: float = 7; // regular speed
 var sneakSpeed: float = 3; // sneaking speed
 var runSpeed: float = 20; // running speed
 
 var walkStep: float = 0.5;
 var sneakStep: float = 1;
 var runStep: float = 0.45;
 
 private var isRunning: boolean = false;
 
 private var chMotor: CharacterMotor;
 private var tr: Transform;
 private var dist: float; // distance to ground
 
 function Start(){
     chMotor = GetComponent(CharacterMotor);
     tr = transform;
     var ch:CharacterController = GetComponent(CharacterController);
     dist = ch.height/2; // calculate distance to ground
 }
 
 function Update(){
     if(chMotor.grounded){
         bobbingSpeed = 0.20;
         bobbingAmount = 0.3;
     } else {
         bobbingSpeed = 0;
         bobbingAmount = 0;
     }
     
     var vScale = 1.0;
     var speed = walkSpeed;
     audioStepLength = walkStep;
     stepSound = 2;
  
  if (!isRunning){
  if (playerStamina < 250){
    playerStamina = playerStamina+2;
  }
  } else if (isRunning){
  if (playerStamina >= 0){
    playerStamina = playerStamina-3;
  }
  }
  
  isRunning = false;
  
     if (Input.GetKey("left shift") && chMotor.grounded){ // press LShift to run
  if (playerStamina >= 3){
    isRunning = true;
    
    audioStepLength = runStep;
    stepSound = 0;
    
    speed = runSpeed;
       bobbingSpeed = 0.30;
       bobbingAmount = 0.3;
      } else {
    isRunning = false;
      }
     }
  
     if (Input.GetKey("c")){ // press C to sneak
         speed = sneakSpeed;
         bobbingSpeed = 0.15;
         bobbingAmount = 0.1;
         
         audioStepLength = sneakStep;
         stepSound = 1;
     }
     
     chMotor.movement.maxForwardSpeed = speed; // set max speed
     var ultScale = tr.localScale.y; // crouch/stand up smoothly 
     tr.localScale.y = Mathf.Lerp(tr.localScale.y, vScale, 5*Time.deltaTime);
     tr.position.y += dist * (tr.localScale.y-ultScale); // fix vertical position
 }
 
 function Update(){
     if(isRunning = true){
         {
             SetFOV(70.0)
         }
     }
     
 function Update(){
     if(isRunning = false){
         {
             SetFOV(60.0);
         }
     }
 }
 }

 Errors: 93,24 unexpected token: false. 93,22 expecting ( found =. 92, 18 ; expected, inset semicolon. 92,10 expecting ( found Update. 88,37 ; expected, inset semicolon. 86,24 unexpected token: true. 86,22 expecting ) found =.