What was found
AFTER TAKE OFF, THERE WAS INDICATION OF (GEAR DOOR OPEN LIGHT, LT MAIN GEAR UNSECURED) RED LIGHT ON WITH LANDING GEAR HANDLE UP WAS PERFORMED. AFTER ASKING CONTROL TOWER ABOUT ANY ABNORMALITIES, GEAR WAS RECYCLED, IN THIS CONDITION IT SHOWS GEAR DOOR OPEN LIGHT ON, ALL OF GEARS DOWN AND SECURE STOPPING CHECK LIST AT THIS POINT BECAUSE OF DIFFERENCE BETWEEN CONFIGURATION AND CHECK LIST. THE INFLIGHT GEAR DOOR OPEN LIGHT ON L,N,R GEAR LIGHT GREEN, CHECK LIST WAS PERFORMED, PROCEED TO LAND IN THIS CONFIGURATION. IAW AMM32-12-01 PAG 204-207 WAS REPLACED DOOR ASSY IB, IAW AMM 32-30-00 PAG 201-206 ADJUSTMENT/TEST EXTENSION AND RETRACTION AND ALTERNATE EXTENSION WAS PERFORMED, TEST ON GROUND SATISFACTORY.