What was found
CREW REPORTED LANDING GEAR DID NOT RETRACT. LANDING GEAR SELECTOR DID NOT MOVE TO UP POSITION AND MANUAL OVER RIDE WAS NOT USED. DURING THIS TIME, LANDING GEAR AIR/GROUND FAIL MESSAGE DISPLAYED AND AIRCRAFT RETURNED AND LANDED WITHOUT INCIDENT. INSPECTION OF LANDING GEAR WAS PERFORMED AND AIRCRAFT FERRIED WHERE MAINTENANCE PERFORMED SEVERAL OPERATIONAL CHECKS. NO DEFECTS NOTED DURING OPERATIONAL CHECKS AND AIRCRAFT RETURNED TO SERVICE.