As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR PACK 2 FAULT WITH AIR PACK 1 ON MEL AND AIR R WING LEAK. PRESSURIZATION COULD NOT BE MAINTAINED. THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO FIELD PHX WITHOUT FURTHER INCIDENT. REMOVED AND REPLACED RIGHT WING ANTI-ICE CONTROL VALVE PER AMM 30-11-51 PB 401. OPS AND LEAK CHECK NORMAL. THE AIRCRAFT WAS GROUNDED.