What was found
ON FLIGHT 3999 (DTW TO BHM) AFTER TAKEOFF GEAR WOULD NOT RETRACT WITH LANDING GEAR HANDLE SELECTED UP. PARKING BRAKE SHUT OFF VALVE AND INBOUND ANTI-SKID CAUTION MESSAGE POSTED. PROBLEM CORRECTED ITSELF AFTER APPROX 2-3 MINUTES. AIRSPEED 180 KNOTS. ALTITUDE 3000. NO GEAR DISAGREE MESSAGE POSTED. REMOVED AND REPLACED LANDING GEAR CONTROL HANDLE IAW CRJ 200 AMM 32-31-01. OPERATIONS CHECK GOOD. PERFORMED EXTENSION AND RETRACTION CHECK IAW CRJ 200 AMM 32-30-00. OPERATIONS CHECK GOOD.