As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL 360 SUCESSFUL CSS ACCOMPLISHED AFTER FAULT LIGHT EXTINGUISHED. GROUNDED - YES. DURING APU BITE TEST FOUND MAINT MSG 49-31016 OVERTEMPERATURE SHUTDOWN IN FAULT HISTORY. NO FAULTS IN CURRENT STATUS. CONTINUE ON B737-800 FIM 49-30 TASK 803. REMOVED AND REPLACED FUEL CONTROL UNIT REFB737-800 AMM 49-31-11. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION TESTS COMPLETED SUCCESSFULLY.