As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 473 BOS-LAX, ENG 1 BLEED FAULT ON ECAM, DURING QRH PROCEDURES ENG 2 PRECOOLER TEMP RISE ABOVE 255 C TRIGGERING AIR ENGINE 2 BLEED FAULT. THIS RESULTED IN A DUAL BLEED FAULT. FLT CREW DECLARED EMERGENCY AND BEGAN EMERGENCY DESCENT. ENGINE 2 RECOVERED WITH PACK 1. PERFORMED TEST OF BLEED AIR SYSTEM REF AMM 36-11-00-710-003. OPS CHECK NORMAL.