As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE ALT WARNING DURING CLIMB THROUGH 10,000FT. CABIN ALTITUDE WAS GREATER THAN 10,000. FOLLOWED QRH, DESCENDED DOWN TO 10,000. COULDN'T GET CABIN ALT BELOW 8900 IN MAN MODE. PUSHED THE EMERGENCY DEPRESS IAW QRH. FOUND THE OVERBOARD EXHAUST SOV DEACTIVATED IN THE OPEN POSITION. DEACTIVATED OVERBOARD EXHAUST SOV IN THE CLOSED POSITION IAW AMM 21-24-00-040-806.