As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CLIMBING THROUGH 12000, THE F/A REPORTED AN ELECTRICAL ODOR AROUND ROW 17. ACFT RETURNED TO DEPARTURE POINT. MAINTENANCE ACTION DETERMINED THAT THE SIDEWALL LIGHTING BALLAST AT ROW 18 TO BE AT FAULT. THE BALLAST WAS THEN REMOVED, THE CONNECTORS WERE STOWED AND AND THE APPLICABLE CIRCUIT BREAKER WAS PULLED. THE ACFT THEN OPERATED IAW MEL 33-21-0. THE BALLAST WAS REPLACED LATER THAT DAY.