As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: MASTER CAUTION LIGHT ILLUMINATED FOLLOWED BY LAVATORY SMOKE ANNUNCIATION ON COCKPIT OVERHEAD, BUT NO SMOKE DETECTED IN RH AFT LAVATORY. ACCOMPLISHED SMOKE DETECTOR FUNCTIONAL TEST IAW AMM 26-14-00, OPS CHECK GOOD.