As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH ALL 3 PACKS OPERATING, UNABLE TO MAINTAIN CABIN ALTITUDE BELOW 10,000. OUTFLOW VALVE FULL CLOSED (MANUALLY). FOUND THRUST RECOVERY VALVE LOCKED OPEN; LUBED OUTFLOW VALVE MECHANISM; CHECK MANUALLY OPERATION NORMAL ON GROUND IN ACCORDANCE WITH DC-10 M/M 21-31-04 AND 21-30-00. TRANSFERED TO DMI NR 20774.