As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C WILL NOT PRESSURIZE IN AUTO/MANUAL. REMOVED CHECK VALVE, REF MM 21-21-01-000-804-002, PARTS AND HARWARE IN AREA. ADD EMP:U353062 PARTS RECEIVED. TETR 1930. REPLACED CHECK VALVE, PER AMM 21-21-01-000-804-002-2. OPS CHECKS GOOD WITH NO LEAKS NOTED.