What was found
FLT 872 BGI-JFK A/C DIVERTED TO SJU, (BRAKE TEMPERATURE MONITORING UNIT) ECAM BRAKE HOT IN FLT. DECIDED TO EXTEND L/G. ECAM TEMP WAS IN EXCESS OF 800 DEG C. NORMAL LANDING, BELOW LANDING WEIGHT. REMOVED AND REPLACED NR 3, 4 BRAKE TEMP MONITORING UNIT IAW AMM 32-47-18-04. OPS CHECK OK.