What was found
FLIGHT 908, ORD-JFK, RETURN TO ORD, LANDING GEAR HANDLE WILL NOT MOVE. HANDLE LOCKED IN DOWN POSITION AFTER TAKEOFF. REMOVED AND REPLACED LANDING GEAR LEVER CONTROL (6GA) IAW 32-31-11-000-001, PERF LG BITE TEST IAW AMM 32-69-00-740-001 AND NORMAL BRAKING ADJ/TEST IAW AMM 32-42-00-710-001, ALL TEST OPS CHECK GOOD.