What was found
ON FLIGHT 4402, CREW REPORTED ON TAKEOFF RECEIVED A LANDING GEAR AIR/GND FAIL CAUTION MESSAGE. LANDING GEAR WOULD NOT RETRACT. CREW ELECTED TO RETURN TO FIELD. ACFT REMOVED FROM SERVICE. FOUND CONNECTOR J0775 LOOSE. RE-TIGHTENED, OPERATIONAL CHECKED GOOD IAW AMM 32-30-00 AND AMM 32-34-00. ACFT RETURNED TO SERVICE. (S)