What was found
A/C RETURNED TO FIELD DUE TO A PERSISTENT LH BRAKE OVERHEAT MESSAGE. A/C DID LAND OVERWEIGHT, AND RTG UNDER OWN POWER UPON LANDING. BRAKE OVERHEAT MSG AFTER TAKEOFF WITH LH OB BRAKE INDICATING 15. BRAKE APPEARED COOL AFTER LANDING. / DEFERRED LH OB BRAKE TEMP READOUT PER MEL 32-46-01 CAT C OPTION 4. M FUNCTION C/W BY DEACTIVATING AND AND STOWING CONNECTOR PER MEL INSTRUCTIONS. REMOVED AND REPLACED LH OB BRAKE TEMP SENSOR IAW CRJ900 AMM 32-46-01-000/400-801-A01. THIS CLEARS MEL.