As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING OUTFLOW VALVE STAYED CLOSED AND PRESURIZED THE A/C, WENT TO MANUAL AND OPENED THE VALVE, WENT BACK TO AUTO AND AGAIN THE VALVE CLOSED. LEFT IN MANUAL OPEN. NR 2 PRESS CNTLR SHOWS FAULT OFV LRU FAIL FAULT CODE 009. FLTS 00 ANDC 01 SHOW 090 FAULT CODE. REPLACED AFT OUTFLOW VALVE ASSY REF MM 21 31 03. PERFORMED MANUAL MODE AND SYSTEM GROUND TEST TO NR 1 AND NR 2 PRESS CNTL SYSTEM PER MM 21 31 00. NR 1 AND NR 2 SYSTEM OPS CHECK GOOD.