As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: DURING CLIMB PASSING 10'000 FEET CABIN PRESSURE INDICATED - 300SWITCHED TO MANUAL MODE AND WAS ABLE TO MAINTAIN CABIN PRESSUREBETWEEN 1000 FEET TO 1200 FEET. REMOVED AND REPLACED CPCS CONTROLLER IAW AMM 21-31-01.