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 AND THE AIRCRAFT RETURNED TO DFW. DURING CLIMB-OUT ENGINE 2 EPR MODE FAULT OCCURRED. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED RELAY BOX 4100KS PER AMM 71-51-49 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.