As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED START DURING 2 ATTEMPTS AT FL400 AND 1 ATTEMPT AT FL340. APU FAULT LIGHT ILLUMINATED ON ALL 3 ATTEMPTS. GROUNDED - YES. R & R INLET TEMP SENSOR PER B737-800 FIM 49-30 TASK 803. NO DEFECTS NOTED NO FAULTS CODES. CLEARS MEL 49-1B C/N 05021533 MEL 49-1B CLEARED, REF DEFECT 60065681 FOR CCS MEL 49-99A.