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. GROUNDED - YES. ACCOMPLISHED APU BITE REF B737-800 FIM 49-60 TASK 810 FOUND FAULT 49-72104 DATA MODULE CIRCUIT FAILURE AND 49-41011 NO FLAME SHUTDOWN. ACCOMPLISHED GVI OF APU WIRE HARNESS REF FIM 49-70 TASK 807, NO DEFECT NOTED. REMOVED & REPLACED APU ECU IAW B737-800 AMM 49-61-12, FAULT 49-72104 STILL PRESENT. FOR BORROWED PART OF APU HARNESS R & R PER AMM 49-11-01. FAULT LIGHT CLEARED.