As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: UNABLE TO CONTROL CABIN PRESSURIZATION IN AUTO OR MANUAL. BOTH CHANNELS. FLIGHT DIVERTED TO PHX, LANDING SAFELY. REPLACED SYSTEM DATA ACQUISITION CONCENTRATOR (SDAC) #1 PER AMM 31-55-34. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.