The flush-mounted 4 function round spa remote has developed a short, according to a reliable pool technician. It's currently disabled. (It was turning on the spa by itself.) He wants $900 to replace it with about $650 of that for labor to pull a new line. Does anyone have experience replacing that type of unit? I presume the wire is run through conduit to the pump (probably 25 yards away), and it's a matter of attaching strong string to pull the new line through? Can it really be that simple? If so, should I put powder or grease or something on the new wire to make it slide through the conduit better? Is this a 9 on the 10 pt toughness scale, or a 3? Do I need a winch to pull it through, or can I just yank with gloves? If the string breaks, will I ever be able to rewire it?