As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. INFLIGHT LAVATORY E, SMOKE & FIRE ALARM, SYS RESET. NO PAX IN OR NEAR LAVATORY. INSPECTED LAVATORY, NO EVIDENCE OF SMOKE OR FIRE. REPLACED LAVATORY E SMOKE DETECTOR & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 26-17-15.