As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: SMOKE DETECTOR LIGHT (MAIN DECK CREW REST) CAME ON BY ITSELF DURING FLIGHT. CARRIED OUT MAIN DECK CREW REST SMOKE DETECTION TEST PER AMM 26-14-20-710-801.NO FAULTS NOTED AND ALL INDICATIONS/OPERATIONS NORMAL AND OK FOR SERVICE.