What was found
AFTER TAKEOFF, PRESSURIZATION SYSTEM FAILED. RETURNED TO BWI AND MADE AN UNVENTFUL LANDING. REMOVED AND REPLACED PRESSURIZATION CONTROL MODULE PER BOEING M/M.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER TAKEOFF, PRESSURIZATION SYSTEM FAILED. RETURNED TO BWI AND MADE AN UNVENTFUL LANDING. REMOVED AND REPLACED PRESSURIZATION CONTROL MODULE PER BOEING M/M.