As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLIGHT ATTENDANT REPORTED PAPER BURNING SMELL IN MID CABIN. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT AND RIGHT PRESSURE REGULATING SHUT OFF VALVES. SYSTEM GROUND CHECK NORMAL OPERATION.