What was found
CLT - FLT 458 EN-ROUTE LIR - CLT. AFTER TAKEOFF, THE NR ONE MAIN BRAKE INDICATED INTERMITTENT OVERHEAT, FROM 200 - 800 DEGREE CELSIUS. THE CREW LOWERED THE GEAR TO COOL THE BRAKES. WHEN THE TEMPERATURES STABILIZED TO 135 DEGREE CELSIUS, THE CREW RAISED THE GEAR AND CONTINUED THE FLIGHT TO CLT. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PLACED THE NUMBER 1 BRAKE TEMP INDICATION ON MEL. MAINTENANCE REPLACED THE NR 1 BRAKE TEMPERATURE SENSOR AND REMOVED THE MEL. OK FOR SERVICE.