As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAB PRESS SYS 1 FAULT CAUTION. T/S PER TSM 21-31-00-810-803-A. FOUND FWD OUTFLOW VALVE INOP. REMOVED AND INSTALLED FWD OUTFLOW VALVE PER AMM 21-31-51-000-801-A AND 21-31-51-400-801-A. OPS CHECKS GOOD PER AMM 21-31-00-710-801-A AND AMM 21-31-00-710-802-A. A/C OK FOR SERVICE VALVE, OUTFLOW; OFF 33-2132-9-0001 62009 ON 33-2132-9-0001 52015