As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT WOULD NOT START WAITED 5 MINUTES WOULD NOT START ON RE ATTEMPT. ON INSPECTION OF APU FOUND PLENUM DOOR FASTENERS LOOSE ON RT AFT CORNER/ ONE RETAINER CLIP WAS MISSING FROM HOUSING (ON ORDER). PER FIM: REMOVED AND REPLACED INLET PRESSURE SENSOR (PER: AMM 49 52 31) & INLET TEMP SENSOR (PER: AMM 49 61 31). INSTALLED RECEPTACLE CLIP ON APU COMPRESSOR INLET CASE PLENUM DOOR. SECURED DOOR REF MM 49 11 00 200 801.