As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING 9000' GOT CABIN PRESSURE ECAM & MASTER WARNING. VERTICAL SPEED WAS UP TO 500+ AND DOWN TO -1200 FPM. CABIN TEMP WENT FROM WARM TO COLD SEVERAL TIMES BEFORE LANDING. RETURNED TO DEN. *S/D* FOUND BROKEN BACKSHELL ON ACTUATOR ELECTRONIC 1, 10HLA OF OUTFLOW VALVE. BROKEN BACKSHELL WAS CHAFING NUMEROUS WIRES. PROTECTED EACH WIRE IN CONNECTOR WITH HEAT SHRINK, REPLACED BACKSHELL AND SECURED.