What was found
AFTER TAKEOFF ON FLIGHT 3563 OUT OF MSP, LEFT MAIN GEAR INTRANSIT LIGHT AND GEAR HANDLE UNSAFE LIGHT REMAINED ILLUMINATED IN FLIGHT. CYCLE GEAR, NO EFFECT. AIR RETURN TO MSP. MAINTENANCE REPLACED LEFT MLG DOOR UPLOCK, REF: 409 CARD 087496 FOR DETAILS. REPLACED PCB P/N 8-060-02, S/N ON A158321, S/N OFF A184904S, PERFORMED OPS AND GEAR CYCLES. OPS CHECK GOOD.