What was found
AIR RETURN, UNABLE TO PRESSURIZE IN FLIGHT. ATTEMPTED TO CONTROL CABIN MANUALLY WITH FULL INCREASE PRESSURE, NO HELP. RESECURED LOOSE DUCT AT LT MIX VALVE. OPS CHECK GOOD ON THE GROUND IAW MM 21-10-05.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR RETURN, UNABLE TO PRESSURIZE IN FLIGHT. ATTEMPTED TO CONTROL CABIN MANUALLY WITH FULL INCREASE PRESSURE, NO HELP. RESECURED LOOSE DUCT AT LT MIX VALVE. OPS CHECK GOOD ON THE GROUND IAW MM 21-10-05.