As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3975 THE CREW REPORTED THAT AT FLIGHT LEVEL 360 AUTO PRESSURE FAILED ON EICAS, O2 MASKS DEPLOYED AND USED. THE CREW DECLARED AN EMERGECNY AND DIVERTED TO STL. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED AIR DATA COMPUTER NR 1 AND NR 2 IAW EMB 140 34-15-01 SYS. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SREVICE.