What was found
ON CLIMBOUT, CREW RECEIVED ECAM MESSAGE FOR NR 1 ENG BLEED FAULT; BLEED TEMP REACHED 280 DEG & CROSSFEED VALVE OPENED; ACFT RETURNED. MX REPLACED FAN AIR THERMOSTAT & OPERATIONALLY CHECKED OUT SYS BY RUNNING ENG FOR AN EXTENDED PERIOD OF TIME AT POWER, CHECKED GOOD. SYS PREVIOUSLY PLACED ON MEL 36-11-04 COND. NR 1 FAN AIR VALVE INOPERATIVE FOR SIMILAR EVENT THAT OCCURRED ON 04/28/2002. NR 1 ENGINE FAN AIR VALVE WAS REPLACED. VENDOR BENCH CHECK OF FAN AIR VALVE, NO FAULT FOUND. VENDOR TEARDOWN OF TEMP CONTROL THERMOSTAT CONFIRMED FAILURE. THERMOSTAT FILTER CONTAMINATED & BLOCKED BY POLLUTION. FILTER WAS CLEANED, AND PACKING (S602-6X1) AND PRESSURE REDUCING CLAPPER GUIDE REPLACED.