As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE AFT L LAV CA'S SIDE. LAV SMOKE WARINING. FA'S REPORTED ALARM WENT OFF, BUT NO SMELL OF SMOKE. NO SIGNS OP SMOKE. MSG SELF EXTINGUISHED AFTER APPROX. 1 MIN. PERFORMED LAV SMOKE DET SYS TEST PER A220 AMM BD-500-A-J26-16 NO FAULT NOTED. OK FOR SVC. (LP# 5123230)