What was found
LEFT MAIN GEAR SHOWED UNSAFE RED LIGHT AFTER TAKEOFF FOR BOTH PRIMARY & SECONDARY INDICATIONS. LG WAS CYCLED AT ALTITUDE IAW THE QRH WITH NO IMPROVEMENT. FOUND LT MAIN GEAR DOOR UP LATCH LINK NOT RETURNING TO LATCH POSITION. R & R LT MLG DOOR LINK, LINK BOLT & BUSHING IAW MM 32-34-03-2 & PERFORMED ADJUSTMENTS & MEASUREMENTS IAW MM 32-34-03-2. COMPLETED UP TO 3B STEP 28 TEST DOOR LATCH MECHANISM AS FOLLOWS. COMPLIED WITH MAIN GEAR DOOR LATCH MECHANISM TEST STEP 28 THRU COMPLETION IAW MM CHAP 32-34-03-2. NO FURTHER FAULTS NOTED.