As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TECHNICAL SERVICES REQUEST APU FAULT REVIEW----(#PRI2/ETOPS)----. GROUNDED - YES. 49 FAULT HISTORY: FAULT 49-41255, START POWER UNIT SHOWS HIGH TEMP DETECTED BY APU CONTROLLER. ON LEGS 1 THROUGH 12. PER B737-9 FIM 49-40-00-810-819. REMOVED AND REPLACED APU START POWER UNIT REF B737-9 AMM 49-41-71/401. ALL OP TESTS PASS. FAULT CODE 49-41255 DOES NOT SHOW IN EXISTING FAULTS. ETOPS GROUND VERIFICATION SUCCESSFUL.