As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: STATUS MESSAGE: DETECTOR 3 LAVATORY DOOR 3 ON ARRIVAL INTO DUB. TROUBLE SHOOTING LAVATORY SMOKE DETECTOR AT LAVATORY 3F-1LC FOR MAIN MESSAGE 26-50055 PER 787 FIM 26-10-F3-31A-421A MSG CLEARED INTERMITTENT FAULT.