What was found
INSPECTION TYPE:SI, AIR TURNBACK AT 0100 UTC UPON GEAR RETRACTION, GEAR LEVER WOULD NOT MOVE PAST OFF POSITION. ALSO, I/B ANTISKID RELEASE REMAINED ON IN FLIGHT WITH GEAR HANDLE IN DOWN/IN POSITION. REMOVED, CLEANED CONNECTOR AND RE-INSTALLED ANTISKID CONTROL BOX. REMOVED AND REPLACED NLG SAFETY SWITCH PER 727 MM 32-09-211. PERFORMED OPERATION CHECK OF ANTISKID SYS CHECK GOOD PER 32-42-00. FUNCTIONAL TESTED GEAR SAFETY SENSOR (SWITCH) GOOD PER 32-21-11. ADJUSTED AND RIGGED NLG PISTON POSITION CABLES PER 727 MM 32-51-00.