As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. AT CRUISE FL360 "LAV SMOKE" LIGHT ILLUMINATED. "LAVS INTERMITTENTLY OCCUPIED" LIGHT EXTINGUISHED AFTER A MINUTE OR TWO (UNSURE WHICH LAVATORY MOST LIKELY LAVATORY "E"). INSPECTED ALL LAVATORY SMOKE DETECTORS. FOUND DEBRIS AT AFT RIGHT HAND LAVATORY SMOKE DETECTORS TEST BUTTON. REMOVED THE DEBRIS FROM TEST BUTTON. OPERATIONS CHECKED NORMAL. ALL SMOKE DETECTORS TESTED NORMAL PER AMM 26-14-00.