As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED PRESSURIZATION FAILED, CABIN WARNING PASSING 10,000 ALL SYS IN NORMAL POSITION. ACFT REMOVED FROM SERVICE. VERIFIED MANUAL PRESSURIZATION WORKS. R & R ELECTROPNEUMATIC OUTFLOW VALVE IAW AMM 21-31-03. OPS CHECKED GOOD IAW AMM 21-31-00. NO DEFECTS NOTED. ACFT RETURNED TO SERVICE.