As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT WAS PREPARING FOR DEPARTURE WHEN FLIGHT CREW SMELLED SMOKE AND "LAV FIRE" LIGHT ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS - MAINTENANCE DISCOVERED TEMP CONTROLLER AND SMOKE DETECTOR PN 72-111111-000 BURNED INTERNALLY - IT COULD NOT BE DETERMINED WHICH WENT 1ST. BOTH UNITS REPLACED AND AIRCRAFT RETURNED TO SERVICE. (TC# 20101206020)