As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START AT FL370 ON 3 ATTEMPTS DUE TO FAULT LIGHT. NO EGT RISE DURING ATTEMPTS. APU STARTED NORMALLY AFTER LANDING. GROUNDED - YES. REMOVED AND REPLACED ELECTRONIC CONTROL UNIT REF AMM 49-61-12. PERFORMED APU BITE TEST REF AMM 49-61-00. NO FAULTS FOUND IN CURRENT STATUS AND FAULT HISTORY'S CURRENT STATUS>. THIS CLEARS MEL 49-1B. C/N 20069593 REMOVED. MEL 49-99A REMAINS UNTIL CSS IS PERFORMED BY FLIGHT CREW. SEAMC PETER NOTIFIED.