As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE VFR TRAINING FLIGHT, THE CREW NOTICED A STRONG ODOR OF AN ELECTRICAL BURN. THE AIRCRAFT ELECTRICAL SYSTEM WAS TURNED OFF AND A LANDING MADE WITHOUT INCIDENT. FAILURE OF THE G2 COMPASS AMPLIFIER WAS FOUND TO BE THE SOURCE. THE TRANSFORMER CONTAINED WITHIN HARD THERMAL DAMAGE INDICATED. NO DAMAGE TO AIRCRAFT STRUCTURE.