What was found
DUE TO GEAR DOOR OPEN INDICATION: AFTER GEAR RETRACTION, RED DOOR OPEN LIGHT REMAINED ILLUMINATED. RAN SECTION 3 PROCEDURES, LT WING GEAR DOOR OPEN LIGHT ILLUMINATES WITH PRIMARY AND ALTERNATE DOOR SELECTION SWITCHES. DOOR IS OPEN WITH AIRCRAFT RUMBLE. UP ON INSPECTION OF LT WING GEAR DOOR, FOUND LT DOOR RELEASE HANDLE NOT FULLY ENGAGED IN THE UP AND CLOSED POSITION. POSITIONED DOOR HANDLE PROPERLY, LT WING DOOR CLOSED, CYCLED HANDLE 3 TIMES. DOOR OPERATION CHECK NORMAL IAW MM. NOTE: NO FUEL DUMPED.