As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DET INOP AND FAULT ILUMINATED DURING TAKE OFF WITH APU OFF PERFORMED FIRE PANEL TEST ALL OTHER FUNCTIONS PASS. PLACING THE APU FIRE DETECTION ON DEFERRAL IAW MEL 2608A. PERFORMED RESISTANCE CHECK OF 3 APU LOOPS FROM CONTROLLER, RESISTANCE CHECKS GOOD, NO SHORT. INSPECTED TERMINALS AT ALL 3 LOOP, TERMINALS CHECK GOOD. CHECKED RESISTANCE OF INDIVIDUAL LOOPS, ALL LOOPS CHECK GOOD. REF FIM 26-10 TASK 808, AND SSM 26-11-31 REMOVED AND REPLACED FIRE OVERHEAT CONTROL PANEL IRW 737 AMM 26-10-01. OPS CHECK GOOD AT THIS TIME.