As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIENCED SMOKE AND FUMES IN THE AC CABIN AFTER PUSHBACK. FLIGHT CREW HAD TUG DRIVER RETURN AC TO JETWAY AND PASSENGERS DEPLANED NORMALLY. MAINTENANCE FOUND A CRACKED WATER LINE ABOVE THE WATER HEATER LOCATED IN THE F/CLASS LAV. THE WATER LINE WAS DRIPPING ON TO A HOT WATER HEATER CAUSING STEAM. THE HOT WATER HEATER WAS REPLACED PRECAUTIONARY AND THE WATER LINE WAS REPLACED.