As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZATION INOP, CABIN WAS UNCONTROLLABLE UNABLE TO MAKE CABIN DESCEND A/C ALTITUDE 10,000 CABIN WAS AT 8000 OUTFLOW VALVE CARGO HEAT CLOSED. CABIN STILL UNCONTROLLABLE IN ALL MODES. GROUND OPS TESTED PRESSURIZATION SYSTEM PER MM 21-30. PRESSURIZED TO 5.0 PSID AND HELD. OK FOR FURTHER FLIGHT. (M)