As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DET INOPERABLE LIGHT ILLUMINATED MOMENTARILY IN FLIGHT. GROUNDED-YES. ACCOMPLISHED B737-800 FIM 26-10 TASK 802, NO FAULTS LOGGED. REPLACED M1925, REF B737-800 AMM 26-15-01-400-801. OPERATIONS NORMAL, REF B737-800 AMM 26-15-00-710-801. AIRCRAFT RETURNED TO NORMAL CONFIGURATION.