What was found
AFTER TAKEOFF & RAISING GEAR HANDLE, ALL 3 GEAR WOULD NOT COME UP. INDICATION WAS 3 GREEN & 3 RED WITH HANDLE IN UP POSITION. RAN CHECKLIST, NO HELP. PUT HANDLE DOWN, REDUCED WEIGHT & LANDED. TROUBLE SHOT IAW FIM 32-30-00-810-815, FOUND MANUAL DOOR EXTENSION SWITCH BAD. R & R SWITCH S1060 IAW MM 32-34-11-820-802. OPERATIONS CHECKED GOOD.