As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING PREFLIGHT CHECK PILOT PULLED THE FIRE HANDLE TO CHECK THE FUEL SHUTOFF VALVE OPERATION, WHEN HE PUSH IT BACK THE VALVE STAYED CLOSED.AFTER INVESTIGATION WE FOUND ALL THE CONTACT ON RELAY (A236K1)CORRODED AND FEW PIN BROKEN. RELAY AND WIRE WAS REPLACED.