What was found
RECEIVED LEVEL 2 ALERT. "BRAKE OVERHEAT". CONFIG PAGE SHOWED NR 3 BRAKE AT 731 DEG. DESCENDED TO FL250 FROM FL350, EXTENDED LANDING GEAR IAW QRH. TEMP IMMEDIATELY WENT DOWN TO 124 DEG AFTER A FEW MINUTES TEMP MATCHED OTHER BRAKES. LANDING GEAR WAS RETRACTED AND CLIMBED TO FL350. INSPECTED NR 3 MAIN LANDING GEAR BRAKE ASSEMBLY, FOUND BRAKE TEMP SENSOR HARNESS BROKEN AT BACKSHELL OF CONNECTOR EXPOSING WIRING. AIU-2 FLAGGED R FWD INBD BRAKE TEMP OUT OF RANGE. BRAKE TEMP SENSOR. FOUND THAT THERE WAS ENOUGH OF A SERVICE LOOP IN WIRE TO RETERMINATE. REF SMP AND WDM 32-46-01, REMOVED DAMAGED SECTION OF WIRING AND RETERMINATED WIRING, ALSO, REMOVED AND REPLACED DAMAGED ELBOW AS WELL AS CONNECTOR P1-2335. BRAKE TEMPERATURE MONITOR SYSTEM CHECKS NORMAL IAW AMM 32-46-02-2. ACFT OK FOR SEVICE.