As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: RIGHT AFT LAVATORY SMOKE DETECTOR WITH EICAS MESSAGE NO SMOKE OR HEAT DETECTED BY CABIN CREW INDICATION EXTINGUISHED IN A FEW SECONDS. MAINTENANCE ACCOMPLISHED A SATISFACTORY LAVATORY SMOKE DETECTOR TEST PER AMM 26-17-00.