As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PASSENGER SMELLED SMOKE IN LAVATORY E. REPORTED HAVING SEEN SPARKS IN THE AREA BELOW THE SINK. F/A CONFIRMED THE ODOR OF SMOKE AND SWITCHED OFF THE WATER HEATER. SMOKE ODOR DISSIPATED. ON THE GROUND, MAINTENANCE HAD A LOOK AND FOUND SOME EVIDENCE OF ARCING AND BURNING. WATER HEATER WAS DEACTIVATED AND PUT ON MEL.