As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON STARTING THE APU, WE RECEIVED APU OVERTEMP WARNING MESSAGE FOLLOWED BY APU FIRE FAIL CAUTION MESSAGE. (FLIGHT #5130 FILED CLOSED) PERFORMED OPS CHECK OF APU IN REFERENCE TO AMM 49-10-00 AND OPS CHECK OF APU FIRE DETECTION IN REFERENCE TO AMM 26-12-00. NO FAULTS FOUND. APU OPERATES NORMALLY.