What was found
ON CLIMBOUT, CREW RECEIVED ECAM MESSAGE FOR NR 1 ENG BLEED FAULT; BLEED TEMP REACHED 280 DEGREES & CROSSFEED VALVE OPENED; ACFT TURNED BACK TO PHX. MX REPLACED THE FAN AIR THERMOSTAT AND OPERATIONALLY CHECKED OUT SYS BY RUNNING ENG FOR AN EXTENDED PERIOD OF TIME AT POWER, CHECK GOOD. SYS WAS PREVIOUSLY PLACED ON MEL 36-11-04 COND. NR 1 FAN AIR VALVE INOPERATIVE FOR SIMILAR EVENT OCCURRED 04/28/2002. NR 1 ENG FAN AIR VALVE REPLACED. VENDOR BENCH TEST REPORT FOR FAN AIR VALVE, NO FAULT FOUND. VENDOR TEAR DOWN OF TEMP CONTROL THERMOSTAT CONFIRMED FAILURE. PROBLEM IDENTIFIED AS FILTER CLOGGED BY POLLUTION. FILTER CLEANED, A PRESSURE REDUCING CLAPPER GUIDE & PACKING SEAL WERE REPLACED.