As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO 1 AND 2 INOP LOST PRESURIZATION. UNABLE TO CONTROL CABIN IN MANUAL MODE AT 27000. AUTO 1 AND 2 INOP ILLUMINATED. CABIN WAS IN DESCENT AT 1500 FPM AND REMAINED IN DESCENT. FOLLOWED PROCEDURES PER POM. WEMT TO MANUAL MODE, THEN CABIN WOULD NOT CONTROL. UNABLE TO CONTROL OUTFLOW VALVE. CABIN BEGAN TO CLIMB. TESTED CONTROLLERS AND OUTFLOW VALVE, UNABLE TO DUPLICATE.