What was found
ORD - FLT 1399 - BEFORE FLIGHT, FIRE APU MESSAGE ON MFDU. WENT OUT IMMEDIATELY AFTER FIRE BOTTLE DISCHARGED. BURNED PLASTIC FOUND IN APU SHROUD. REPLACED AUXILIARY POWER UNIT. SYSTEM GROUND CHECK NORMAL OPERATION. (M)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ORD - FLT 1399 - BEFORE FLIGHT, FIRE APU MESSAGE ON MFDU. WENT OUT IMMEDIATELY AFTER FIRE BOTTLE DISCHARGED. BURNED PLASTIC FOUND IN APU SHROUD. REPLACED AUXILIARY POWER UNIT. SYSTEM GROUND CHECK NORMAL OPERATION. (M)