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 IN LAVATORY 3R HAD A FALSE INDICATOR LIGHT AND EICAS MESSAGE. ACCOMPLISHED INSPECTION OF FIRE EXTINGUISHER PER AMM 26-24-01, TEMPERATURE INDICATOR STRIP PER AMM 26-24-02, AND LAVATORY SMOKE DETECTOR OPERATIONAL CHECK PER AMM 26-13-00-00B-320A. OPERATIONAL CHECK GOOD.