What was found
DURING CLIMBOUT, AFTER GEARS WAS RETRACTED THE DOOR NOT LATCH LIGHT REMAINED ON. THE CREW CYCLED THE GEARS, DOOR NOT LATCH LIGHT STILL REMAINED ON, AFTER ACCOMPLISHING UPLATCH CHECK LIGHT WENT OUT. THEY LANDED WITHOUT FURTHER INCIDENT. MX INSPECTED BOTH LT AND RT DOOR WARNING SWITCHES AND WIRING, FOUND LT PROXIMITY SWITCH TARGET PIVOT BOLT LOOSE. THEY TIGHTEND BOLT. OPS CHECK GOOD IAW WD 32-01-01, MM 32-60-0. ACFT WAS RETURNED TO SERVICE.