What was found
(CAN) DURING PREFLIGHT CHECKS, CREW NOTICED FALSE FIRE WARNING, FUEL SHUTOFF VALVE ACTUATION, ALTHOUGHT VALVE ACTUATION WAS AUDIBLE. AIRCRAFT WAS FERRIED TO MAINTENANCE FACILITY FOR REPAIRS. WIRING SUSPECTED AS CAUSE OF FALSE INDICATIONS HOWEVERE MEG OF WIRING REVEALED NO SHORTS. PRIMARY WIRES WERE TO BE REPLACED BUT DURING PROCESS, A CHAFFED WIRE WAS DISCOVERED UNDER THE FORWARD CLOSET AREA, BEHIND THE TCAS RX / TX. OCCASIONALLY, THE WIRE WAS MAKING CONTACT WITH A KNURLED FITTING RELATING TO THE TCAS. THE WIRE WAS REPAIRED AND THE AREA PROTECTED FROM ADDITIONAL CHAFFING. AIRCRAFT RETURNED TO SERVICE.