As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED AFTER ENGINE ANTI-ICE WAS TURNED OFF THEY THEN LOST PRESSURIZATION. EMERGENCY DESCENT TO 10,000 WAS ACCOMPLISHED. AT 10,000 CABIN PRESSURIZATION RETURNED TO NORMAL. FLIGHT LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT PACK PRESSURE REGULATOR VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.