What was found
PILOTS REPORTED THAT AFTER LIFTOFF, APPROXIMATELY 10 SECONDS LATER THE OUTBOARD ANTI-SKID INOP LIGHT TURNED ON, THEN OFF, FOLLOWED BY THE INABILITY TO PUT THE GEAR HANDLE UP. A FEW MINUTES LATER, THE OUTBOARD INOP LIGHT TURNED ON AGAIN, THEN OFF. APPROXIMATELY 5 MINUTES LATER THEY TRIED TO MOVE THE GEAR HANDLE UP AND IT DID NOT MOVE. MAINTENANCE CLEANED THE LT & RT PROXIMITY SWITCH CONNECTORS IAW GLA GMM 9.3.0. OPERATIONAL CHECK WAS GOOD. OPERATIONAL CHECK FLIGHT WAS PERFORMED AND WAS SATISFACTORY.