As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APU FIRE EXTINGUISHING CIRCUIT OPERATIONAL CHECK, STEP C: APU AUTO EXTINGUISHING CIRCUIT DOES NOT PASS. DEFERRED APU AUTO FIRE SHUTDOWN SYSTEM. REMOVED AND REPLACED 32WF RELAY ON 250VU. SYSTEM OPERATIONAL CHECKED OK IAW MM 26-22-00.