As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED ACRID ODOR DURING CLIMBOUT. CREW ACCOMPLISHED QRH PROCEDURE. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED O-RING THAT WAS LEAKING AT VERTICAL CONTROL VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.