As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. DURING DESCENT FROM FL340 TO FL200 RECEIVED CABIN ALTITUDE WARNING. CABIN ALTITUDE WENT TO 10500. INITIATED IMMEDIATE DESCENT TO 10000. ACCOMPLISHED AMM 21-31-02 TEST ON BOTH CABIN ALTITUDE CONTROLLERS WITH NO FAULT FOUND. OK FOR SERVICE.