As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PRESSURIZATION CONTROL PANEL FLT ALT IS STUCK AT 21,000. WILL NOT ADJUST. REPLACED CABIN PRESSURE CONTROLLER #1 (AALA202003079006) AND #2 (AALA202003079007 )PER AMM 21-31-00. ALSO REPLACED CABIN PRESSURE CONTROL MODULE IN OVERHEAD PANEL (AALA202003079008) PER AMM 21-31-00.