As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO PRESSURIZATION UNABLE TO CONTROL PRESSURE. CONTRACT MAINTENANCE PERFORMED MX PROCEDURE FOR DEFERRAL. NEXT FLIGHT RETURNED TO GJT WITH MANUAL PRESSURIZATION INOPERATIVE REMOVED AND REPLACED ELECTRO OUTFLOW VALVE IAW MM 21-30-03. OPS CHECK GOOD.