As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN RATE PASSING 3000'. CLIMBED TO 9000' OUTFLOW VALVE WAS STUCK OPEN. RTB KMEM. AMM: 21-31-20. REMOVED AND REPLACED CABIN OUTFLOW ACTUATOR IAW AMM 21-31-20-2. FUNCTIONAL TEST OF CABIN PRESSURE CONTROL SYSTEM TASK 21-31-00-700-801. CHECKS GOOD CPC-1 AND CPC-2 PASSED.