As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE EICAS AND ALARM. FOUND PRINTED CIRCUIT BOARD ON NS/FSB SIGN LOOSE MAKING CONTACT WITH LAV S COMPOSITE WALL WHICH OVERHEATED AND CREATED SMOKE IN THE LAV. REPLACED NS/FSB SIGN REF AMM 33-24-00-962-081. OP'S CHECK GOOD REF AMM 33-24-00-710-801.