What was found
SHORTLY AFTER LEVELING AT FL310 CABIN CLIMBED UNCONTROLLABLY, PERFORMED APPROPRIATE CHECKLIST AND RETURNED TO (SAT). REGAINED CONTROL OF CABIN AT FL180. REMOVED AND REPLACED AUTO PRESSURE CONTROLLER. OPS CHECK GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
SHORTLY AFTER LEVELING AT FL310 CABIN CLIMBED UNCONTROLLABLY, PERFORMED APPROPRIATE CHECKLIST AND RETURNED TO (SAT). REGAINED CONTROL OF CABIN AT FL180. REMOVED AND REPLACED AUTO PRESSURE CONTROLLER. OPS CHECK GOOD.