As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APPROXIMATELY FORTY MILES OUTSIDE THE FLIGHT CREW DECLARED AN EMERGENCY DUE TO AN ELECTRICAL BURNING ODOR IN THE COCKPIT. THE FLIGHT CREW DONED THEIR OXYGEN MASKS AND LANDED THE AIRCRAFT WITHOUT AN INCIDENT. FOUND MODULAR AVIONICS UNIT CIRCUIT BREAKER POPPED AND DC POWER SUPPLY 3 BURNT. REPLACED MODULAR AVIONICS UNIT ONE POWER SUPPLY 3 MODULE AND SERVICE OXYGEN.