As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6165 - IAD - FLIGHT CREW REPORTED AUTO PRESS ERRACTIC. IAD MX MEL`ED THE SYSTEM. RIC MX PERFORMED OPERATIONAL CHECK OF AUTO PRESSURIZATION AND COULD NOT DUPLICATE FAIL. MX REMOVED AND REPLACED MANUAL PRESSURIZATION CONTROLLER AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE. (SDR # C2XA11RI090)