As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL300 THE CABIN RATE STARTED CLIMBING ABNORMALLY TILL IT REACHED 6000 FT IAW MINT THE 10,000 FT CABIN ENUNCIATORS ILLUMINATED AND THE EMER PRESS CAME ON. OXYGEN MASKS DROPPED IN THE CABIN. DECLARED AN EMERGENCY AND STARTED AN EMERGENCY DESCENT TO 10,000. REPLACED FAILED CABIN ALT. CONTROLLER, INSTALLED A SERVICEABLE UNIT, OPS CK GOOD IAW MM CH 21-31-00.