As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LARGE AMOUNT OF SMOKE CAME OUT OF CIRCUIT BREAKER PANEL (RADIO-NAV), BEHIND CAPTAIN'S SEAT AT ARRIVAL AT GATE. OPENED CP WINDOW AND SMOKE IMMEDIATELY CLEARED. COMPLIED WITH TASK 05-51-26. COULD NOT DUPLICATE SMOKE & ODOR. REPLACED RECIRCULATION AIR FILTERS IAW 21-25- 01.