What was found
(CAN) AIRCRAFT RETURNED TO DEPARTURE AIRPORT DUE TO AN ELECTRICAL ODOR IN THE FORWARD LAVATORY. CREW PULLED APPROPRIATE CIRCUIT BREAKERS TO ISOLATE AND RETURNED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTION DISCOVERED THE FORWARD L1 LAVATORY LIGHT BALLAST, PN 61-48-2, IPC 33-26-52-66-70, OVERHEATED THAT HAD ALSO CAUSED AN UPPER FLUORESCENT LIGHT SOCKET TO OVERHEAT. MAIN CONNECTOR DISCONNECTED ABOVE THE LAV TO ISOLATE THE LIGHTING SYS AND 1L LAV DEFERRED IAW MEL 38-30-01-1. BALLAST AND AFFECTED LIGHT SOCKETS TO BE REPLACED.