As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SHUTDOWN, CABIN DOORS SHOWED PRESURIZATION RED LIGHTS WARNING. VERIFIED BOTH OUTFLOW VALVES OPENED & 0 PSI DIFFRENTIAL. CORRECTIVE ACTION: NO FAULT IN PLF. T/S PER TSM A350-A-52-71. PERFORMED BITE TEST OF THE DSCS - PASS, PER A350 AMM 52-71.