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