What was found
SHIP 9510 -FIRE- WORKING APU MEL FOR NO START, TECHNICIANS REPLACED FCU AND START FUEL PURGE VALVE. APU WAS RUNNING FOR 15 MINUTES FOR LEAK AND OPS CHECKED WHEN FIRE WARNING ANNUNCIATION SOUNDED. FIRE WAS CONFIRMED, FIRE HANDLE PULLED, BOTTLE DISCHARGED. DUE TO APU ACCESS DOORS OPEN FOR LEAK CHECK, REQUIRED USE OF RAMP FIRE EXTINGUISHER TO PUT OUT FIRE. CORRECTIVE ACTION: REPLACED APU, FIRE DETECTION ASSEMBLY, FIRE BOTTLES, AND FCU. (LP 0395848)