As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK INSP NOTED OPS TEST OF APU AUTO FIRE EXTINGUISHING EXITING CIRCUIT AND THE APU LOW PRESSURE VALVE OPERATION USING EACH INDIVIDUAL MOTOR IN TURN AND TEST APU EMERGENCY SHUTDOWN CIRCUIT FAILS. MAINT REMOVED AND REPLACED RELAY 39WF AND OPS CHECKED GOOD. ALL WORK WAS COMPLETED IAW TSM 26-22-00-810-804 AND AMM 26-22-00-710-002. UPON COMPLETION OF THE REPAIR IT WAS INSPECTED AND FOUND ACCEPTABLE. (A)