As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: THROUGH 11000 FT WE GOT A CABIN ALTITUDE WARNING HORN, WE DESCENDED IMMEDIATELY BACK TO 10000 FT; RAN THE CHECKLIST AND COULD NOT GET THE AIRCRAFT TO PRESSURIZE. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW. (OPEN).