As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R2 LAVATORY SMOKE ANNUNCIATED WITH CHIMES, FLIGHT ATTENDANTS CHECKED LAVATORY, WENT THROUGH TRASH CAN AND QUERRIED PAX. UNABLE TO SUBSTANTIATE. CARRIED OUT OPERATIONAL TEST OF LAVATORY SMOKE DETECTOR IAW DMC-B787-A-26-13-00-00B-320A-A. CARRIED OUT INSPECTION OF LAVATORY WASTE COMPARTMENT TEMP INDICATOR STRIP IAW DMC-B787-26-24-01-00B-921A-A. ALL TESTS SATISFACTORY.