As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AT FL300 CABIN ALTITUDE WENT FROM 6.2-10.3 INTO THE RED AND RECEIVED PACK 2 FAIL. CREW DECLARED AN EMERGENCY AND RETURNED TO FIELD AT ABQ AND LANDED WITHOUT INCIDENT. MAINTENANCE T/S PER EMB AMM TO PACK DUCT AT BELLOWS INOP, REPAIRED, AND OPS CHECK GOOD. A/C WAS THEN RETURNED TO SERVICE.