As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THE CREW WAS UNABLE TO PRESSURIZE THE AC AND RECEIVED INTERMITTENT DOOR OPEN INDICATION. THE CREW PERFORMED AND AIR-TURN-BACK. MX INSPECTED THE AC INCLUDING PRESSURIZATION AND DOOR INDICATION. THE AC WAS PRESSURIZED TO MAXIMUM PRESSURE DIFFERENTIAL WITH NO DEFECTS NOTED. THE AC WAS RETURNED TO SERVICE. (K)