What was found
WHILE TAXIING, THE APU FIRE WARNING ACTIVATED AND THE APU FIRE BOTTLE WAS DISCHARGED. AIRCRAFT RETURNED TO THE GATE. FOUND B-LOOP FIRE WARNING SYSTEM INOPERATIVE, SYSTEM ON DEFERRAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE TAXIING, THE APU FIRE WARNING ACTIVATED AND THE APU FIRE BOTTLE WAS DISCHARGED. AIRCRAFT RETURNED TO THE GATE. FOUND B-LOOP FIRE WARNING SYSTEM INOPERATIVE, SYSTEM ON DEFERRAL.