As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO BOARDING THE SMOKE DETECTOR IN THE LAV STARTED GOING OFF. REMOVED FROM SERVICE. PERFORMED GVI, NO DEFECTS NOTED. PERFORMED OPS CHECK OF LAV SMOKE DETECTOR IAW MM 26-12-11-710-801. OPS CHECK GOOD. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.