As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSTRUMENT LIGHTS FAILED. TWO MINUTES LATER, THE INSTRUMENT LIGHTS CIRCUIT BREAKER TRIPPED. PILOT RESET THE CIRCUIT BREAKER. APPROXIMATELY FOUR MINUTES LATER, THE SMELL OF SMOKE WAS OBSERVED. AIRCRAFT WAS ON FINAL APPROACH AT THIS TIME AND SAFE LANDING WAS ACCOMPLISHED. NO EVIDENCE OF FLAME INSIDE OR AROUND LIGHT CONTROL UNIT. APPARENT INTERNAL SHORT OF CIRCUIT BOARD CAUSED ODOR OF BURNING WIRES AND SMOKE.