As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED ON TWO ATTEMPTS. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 49-10 TASK 806 FOR A 49-15004 FAULT. ALL INLET DOOR ACTUATOR AND DOOR POS S/W OPS WERE NORMAL. DUE HISTORY OF THIS FAULT, REMOVED & REPLACED AIR INLET DOOR POS SW PER B737-800 AMM 49-15-41. OPS CK GOOD AND NO CURRENT FAULTS PRESENT.