What was found
FIRE SYSTEM FAULT DISPLAYED FOR THE APU. MAINTENANCE INQUIRED THE MDC AND FOUND THE FIRE LOOP (B) OPEN. PLACED ON MEL 26-12-1B RSI 357909. AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FIRE SYSTEM FAULT DISPLAYED FOR THE APU. MAINTENANCE INQUIRED THE MDC AND FOUND THE FIRE LOOP (B) OPEN. PLACED ON MEL 26-12-1B RSI 357909. AIRCRAFT RETURNED TO SERVICE.