As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK DEFERRED. RT PACK AUTO SHUTDOWN. CREW DECLARED EMERGENCY. RETURNED TO FIELD. R & R PRESSURE REGULATING/SHUTOFF VALVE IAW AMM. PN ON 979998-2 SNON 5336, PN OFF 979998-2, SN OFF 4453. R & R BLEED AIR SHUTOFF VALVE IAW AMM. PN ON 3215622-1, SN ON 1201, PN OFF 3215622-1, SN ON 942.