As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7584, ENROUTE RAP - FSD DISCREPANCY: WHILE ENROUTE, THE CREW EXPERIENCED A LOSS OF CONTROL OF MANUAL PRESSURIZATION AND CABIN PRESSURE WAS UNCONTROLLABLE. THE AIRCRAFT WAS DIVERTED TO KPIR. CORRECTIVE ACTION: MAINTENANCE DEFERRED THE ISSUE. THE DEFERRAL WAS CLEARED BY REPLACING THE PNEUMATIC OUTFLOW VALVE AND MANUAL CONTROLLER. MANUAL CONTROLLER PN# 912D0401 SN# 568