What was found
ATB- BEFORE ENTERING THE ETOPS TRACK THE CREW NOTICED THE LT ENGINE BLEED TEMP RISE TO 490 WITH THE ENG A/I ON. RETURNED TO DEPARTURE. R/R L/T ENG OVERTEMP SENSOR PER AMM 36-11 ALSO R & R LT ENG NORMAL TEMP SENSOR PER AMM 36-11. R & R L/T ENGINE FAMV PER AMM 36-11. REPLACED PRV & PILOT VALVE. REPLACED FAN AIR TEMP SENSOR. REPLACED OVER TEMP LIMIT SENSOR. REPLACED AIR SUPPLY THERMAL OVER TEMP SWITCH AMM 36-22 AND PRECOOLER DISC TEMP SENSOR IAW AMM 36-22. RAN BOTH ENGINES, BLEED CK OK, BLEED SHIFT CK OK.