What was found
(CAN) AFTER TAKEOFF, CREW REPORT HE RECEIVED NR 3 BRAKE OVERHEAT MESSAGE PRIOR TO GEAR UP. THEY FOLLOWED QRH AND LEFT GEAR DOWN FOR 5 MINUTES. LIGHT EXTINGUISHED, FLIGHT CONTINUED. CREW ELECTED TO DECLARE AN EMERGENCY LANDING. CAPTAIN MADE ANNOUNCEMENT TO PASSENGER. FLIGHT LANDED UNEVENTFULLY. DEFECT 948874 IS RAISED. MAINTENANCE COMPLETED TROUBLESHOOTING AND FOUND ANTI-SKID CONTROL UNIT AT FAULT. ANTI SKID CONTROL UNIT REPLACED AND SYSTEM GROUND CHECK SERVICEABLE. AIRCRAFT RETURN TO SERVICE. THIS INCIDENT WAS REPORT ON SAFETY/IRREGULARITY REPORT 101106-14.