As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE, APPROX 45 MINUTES, CREW HAD A LEVEL 3 ALERT FOR BLEED AIR TEMP HIGH. NR 1 AIR SYS AUTO SHUTDOWN AND NR 2 SYS WAS ON DMI. CREW FOLLOWED QRH PROCEDURES AND COMPANY SOP. OPS AND CREW DECIDED TO RETURN TO DEPARTURE FOR MX EVALUATION. NO FUEL WAS DUMPED AND ACFT RETURNED WITHOUT FURTHER INCIDENT. R & R NR 1 ENGINE HIGH STAGE PILOT VALVE ASSY IAW AMM 36-11-20. PERFORMED ENGINE RUN AND FUNCTIONAL TEST OF THE VALVE IAW AMM 36-11-20. OPS CHECKED GOOD.