As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT FROM FL250, CABIN PRESSURE SPIKED TO 12500, CABIN LIGHTS ILLUMINATED AND NO SMOKING/SEATBELT SIGNS ILLUMINATED. POWER LEVERS WERE AT IDLE DUE TO TURBULENCE. ALTITUDE WARN ANNUNCIATOR DID NOT ILLUMINATE AND PAX O2 MASKS DID NOT DEPLOY. WHEN POWER WAS ADDED AND RATE INCREASED, CABIN DESCENDED BELOW 10000 AND WORKED PROPERLY. PRESSURIZATION CONTROLLER WAS FOUND FAULTY AND WAS REPLACED. ANOTHER SDR WILL BE FILED FOR THE ALTITUDE WARNING ISSUE.