As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - FLT 1901 - DURING CRUISE AT FL 330, PRESSURE WARNING WITH DIFFERENTIAL PRESSURE OF 9.4 PSI IN AUTO MODE. CREW MANUALLY DEPLOYED OXYGEN MASKS AND EXECUTED EMERGENCY DESCENT. REPOSITIONED OVEBOARD VALVE PRESSURE. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)