As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE LIGHT BRIEFLY ILLUMINATED (3-5 SEC) FLIGHT ATTENDANT INVESTIGATED AFT RIGHT LAVATORY. BURNING PLASTIC SMELL NOTED WHICH DISSIPATED AFTER DOOR OPENED. PERFORMED LAVATORY SMOKE DETECTOR TEST PER AMM 26-14-00-501.