What was found
AFTER DEPARTURE IN CLIMB, NOTICED STRONG ODOR LIKE ELECTRICAL WIRES HEATING UP, AFT CABIN F/A ALSO DETECTED SAME THING, F/A SAYS IT WAS VERY STRONG ELECTRICAL ODOR. AIRCRAFT RETURNED TO MSP LANDING UNEVENTFULLY, PASSENGERS THROUGHOUT CABIN DETECTED SIMILAR ODOR. REPLACED SEALS AND GROUND STRAP ADJACENT TO NR 1 PACK FLOW CONTROL VALVE. REPLACED NR 1 PACK FLOW CONTROL VALVE. REPLACED SLEEVE, ELBOW AND SEALS ADJACENT TO HEAT EXCHANGER. REPLACED L/R OZONE CONVERTERS. REPLACED RECIRCULATION FILTERS. CHECKS OK.