As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED EMERGENCY. CABIN ALTITUDE HORN SOUNDED ALONG WITH RAPID DECOMPRESSION & CABIN MASKS DROPPED. CABIN PRESSURE CONTROLLABLE IN ALTERNATE MODE. REMOVED AND REPLACED BOTH CABIN PRESSURE CONTROLLERS, CABIN AFT OUTFLOW VALVE & CABIN PRESSURIZATION CONTROL MODULE PER MM.