As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT GATE PRIOR TO PUSH BACK, A STRONG ELECTRICAL ODOR EMANATED FROM THE AFT LAVATORY AREA IN THE CABIN. MAINTENANCE FOUND THE LAVATORY BLOWER MOTOR CIRCUIT BREAKER HAD TRIPPED OPEN. MAINTENANCE REPLACED THE LAVATORY WASTE VENT SYSTEM BLOWER.