As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - DURING CLIMBOUT INTERPHONE CAUSED EXTREME AUDIO STATIC. CAPTAIN WAS UNABLE TO TRANSMIT OR HEAR USING HIS AUDIO SELECT PANEL. EMERGENCY DECLARED RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND EXTERNAL FLIGHT INTERPHONE JACK CONTACTS BROKEN AND SHORTED TOGETHER. REPLACED INTERPHONE JACK. SYSTEM GROUND CHECKED NORMAL OPERATION.