What was found
RH BRAKE OVER HEAT MSG AROUND FL 170. RAN THE QRH THEN THE MSG CLEARED. CREW THEN UNDECLARED AND EMERGNECY AND LANDED IN KCLT WITHOUT ANY ISSUES. RH IB BRAKE MADE BRAKE OVHT WARNING MESSAGE. COMPLIED WITH QRC AND QRH / DEFERRED #3 BRAKE TEMP SENSOR INDICATION IAW CRJ900 MEL 32-46-01 CAT C OPTION 4. M/FUNCTION CW BY CAP AND STOWING #3 BRAKE TEMP SENSOR HARNESS AND CONNECTOR AND CAPPING #3 THERMOCOUPLE AS PER MEL INSTRUCTIONS. RECLASSIFIED MEL 32-46-01 OPT 4 TO 32-46-01 OPT 3. M'FUNCTION PREVIOUSLY C/W."