As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING THE GROUND RUNS AFTER INSPECTION IT WAS FOUND THAT THE FIREWALL SHUT OFF WOULD NOT WORK PROPERLY TO SHUT THE ACFT DOWN. SOME LEAKAGE WAS FOUND PAST THE VALVE. A NEW VALVE WAS INSTALLED AND TESTED WITH NO FAULTS FOUND. THE TOTAL TIME SINCE NEW OF THE VALVE IS UNKNOWN BUT IT IS ASSUMED IT IS THE SAME AS THE ACFT TIME 5700 HOURS.