As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CABIN PRESSURE SAFETY VALVE OPEN ELECTRONIC CENTRALIZED AIRCRAFT MONITOR. AT FL 340 CABIN PSI 7.8. CABIN ALT 7000. FOLLOWED ELECTRONIC CENTRALIZED AIRCRAFT MONITOR PROCEDURE DECENT TO FL 300. SAFETY VALVE CLOSED 7.9 PSI CABIN ALT 5000. REMOVED AND REPLACED NUMBER 1 (AALA202110157922) AND NUMBER 2 CABIN PRESSURE SAFETY VALVES PER AMM 21-31-52.