As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDIS 990 21-30 7143 11AUG20 SGF FACT U. CABIN ALTITUDE WARNING AT FL 340. FACT 12AUG20 00:20 SGF U. REMOVED AND REPLACED BOTH NR 1 AND NR 2 AUTO PRESSURE CONTROLLERS, PER MM 21-31-02-4. BOTH OPERATIONS CHECK GOOD. ALSO RIGHT PACK FLOW CONTROL VALVE CHANGED ON WRI 2130-7144.