What was found
DUE VERIFICATION FLIGHT DUE TO LT MLG UNSAFE LIGHT. VERIFICATION OF LANDING GEAR OPERATION FAILS. WHEN GEAR HANDLE SELECTED DOWN GOT 3 GREEN AND AMBER DOOR LIGHT. PERISCOPE CONFIRMED GEAR DOWN AND LT DOOR OPEN. SLOWED DOWN TO 180KTS - DOOR LIGHT GOES OUT. AFTER SHUTDOWN LEFT DOOR STARTS OPENING. FOUND CRACK IN INNER DOOR SKIN AT ACTUATOR ATTACH FITTING. REMOVED LT MLG DOOR IAW MD90 AMM 32-10 (252122). INSTALLED NEW LT MLG DOOR PER MD90 AMM 32-10. PERFORMED GEAR SWINGS, ALL GEAR INDICATIONS NORMAL PER MD90 AMM 32-32 (LP5772918)