As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZATION AUTO FAIL LIGHT ILLUMINATED UNABLE TO CONTROLL PERFORMED PRESSURIZATION SYSTEM GROUND TEST PER AMM TASK 21-31-00. BITE TEST SHOWED OUTFLOW VALV FAIL CODE. REMOVED AND REPLACED AFT OUTFLOW VALVE PER AMM 21-31-03. OP CHECK GOOD.