What was found
OCCURRED ON THE GROUND THE ENTIRE TIME. AS THE CREW WAS TAXIING OUT, THEY RECEIVED A BRAKE OVERHEAT CAUTION MESSAGE. THE CREW DECLARED WITH ATC ON THE GROUND, AND HAD FIRE & RESCUE TRUCKS FOLLOW THEM BACK TO THE GATE IN CASE ANY BRAKE COMPONENTS IGNITED. INFRARED TEMPERATURES WERE TAKEN AND ALL BRAKES WERE THE SAME TEMPERATURE AND NO IGNITION OCCURRED. MX WAS CONTACTED UPON RETURN TO THE GATE. MEL 32-46-1(15) WAS ADDED, ALLOWING THE FLIGHT TO CONTINUE. / REMOVED AND REPLACED RH OB BRAKE THERMOCOUPLE IAW CRJ-900 AMM 32-46-01-000/400-801-A01. OPS CHECK GOOD THIS CLEARS MEL.