As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED ELECTRICAL ODOR IN COCKPIT DURING CLIMBOUT. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT PRESSURE REGULATOR SHUT-OFF VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.