As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER ADJUSTING THE CAPTAIN'S MAP LIGHT RHEOSTAT, THE MAP AND BRIEFCASE CIRCUIT BREAKER OPENED. THERE WAS A STRONG SMELL OF BURNING WIRE FOR A FEW SECONDS AFTER THE CIRCUIT BREAKER OPENED. REPOSITIONED SHORTED WIRE TO THE MAP LIGHT HOUSING.