What was found
(CAN) DURING CRUISE CREW RECEIVED BRAKE OVERHEAT WARNING , LT OUTER BTMS SHOWING INCREASING BRAKE TEMP UP TO 20 UNITS, THEN STARTED TO DECREASE. AIRCRAFT DESCENDED TO LOWER ALTITUDE AND SPEED SLOWED. BRAKE TEMP STARTED TO RISE TO 18 UNITS. GEAR EXTENDED, BRAKE TEMPS RETURNED TO NORMAL GREEN INDICATION. RETURNED TO ORIGINATING AIRPORT, NORMAL LANDING. MAINTENANCE FOUND NR 1 BRAKE TEMP SENSOR HAD CORRODED PINS. BRAKE TEMP SENSOR REPLACED. AIRCRAFT RETURNED TO SERVICE. (NOTE: PART IS AN EXPENDABLE AND SYSTEM DOES NOT TRACK COMPONENT TIME. TIMES PROVIDED ARE AIRCRAFT TOTAL TIME.) (TC NR 20070524004)