What was found
BOS - FLT 68 - EN ROUTE MIA-MAD - BURNING ELECTRICAL SMELL OCCURRED IN THE FIRST CLASS CABIN NEAR SEATS 3A AND 3B. DISSIPATED AFTER A FEW MINUTES. AFTER SMELL RETURNED, CREW TURNED OFF UTILITY BUSSES AND RECIRCULATING FAN. DIVERTED TO BOS AND LANDED WITHOUT INCIDENT. REPAIRED WIRE AT FIRST CLASS LAV F2 RETURN TO SEAT SIGN. SYSTEM GROUND CHECK NORMAL OPERATION. (M)