As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WOULD NOT PRESSURIZE AFTER TAKEOFF, SWITCHED CONTROLLERS, TRIED MANUAL NO ABNORMAL INDICATION. DURING TROUBLESHOOTING OF ACFT PRESSURIZATION SYS FOUND CABIN PRESSURE TUBE ASSY B NOT CROSS THREADED. R&R CABIN PRESS TUBE ASSY IAW MM 21-31-00 REF W/C 9 FOR LEAK CHECK.