What was found
AFTER TAKEOFF, THE LANDING GEAR WILL NOT RETRACT WITHOUT USING THE OVERRIDE SWITCH, TRIED SEVERAL TIMES TO RAISE THE GEAR NORMALLY. MAINTENANCE REPLACED RELAY GA30 AND LT STRUT TO BE UNDERSERVICED IN LOWER CHAMBER, SERVICED IAW AVRO MM 32-10-14. LUBRICATED ALL GREASE FITTINGS, VERIFIED NORMAL OPERATION OF SQUAT SYSTEMS AND LANDING GEAR HANDLE. GOOD FOR CONTINUED SERVICE.