As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT FA REPORTED THAT FWD LAV SMOKE DETECTOR BEEPED FOR ABOUT 20 SECONDS. NO SMOKE FUMES NOTED. FOUND COPIOUS AMOUNTS OF DUST & DEBRIS ON TOP OF SMOKE DETECTOR. REMOVED & REPLACED FWD LAV SMOKE DETECTOR. OK FOR SVC PER MD88 AMM 26-13.