As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT GOT A LAV SMOKE EICAS AND HORN FROM MID LAV. NO VISIB LE SMOKE OR ODOR PRESENT WHILE REMOVING SMOKE DETECTOR IN MID LAV FOUND ONE SCREW STRIPPED. REQUEST SHEET METAL ASSISTANCE. REMOVED STRIPPED SCREW PER SRM 51-40-02. REMOVED AND REPLACED LAV S SMOKE DETECTOR IAW AMM 26-15-01. PERFORMED SELF AND SMOKE TEST. OPS CHECK GOOD AT THIS TIME. OK TO CONTINUE.