As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WOULD NOT PRESSURIZE ON TAKEOFF. RECEIVED CABIN ALT CAUTION MESSAGE AND COOL CAUTION MSG. FOUND MCD PRESSURIZATION FLAPPER DOOR STUCK OPEN WHEN MCD FULLY CLOSED. REPLACED TAPER PINS IAW AMM AND SRM. PRESSURIZED ACFT ON GROUND, PN'S: 601R38656-1 & MS24692-65AP.