As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE LANDING PHASE OF THE FLIGHT THE PILOT VISUALLY OBSERVED SMOKE COMING FROM THE NR 1 AVIONICS BUS TIE SWITCH/BREAKER. THE PILOT TURNED OFF THE SWITCH, WHICH DEACTIVATED THE CIRCUIT AND REMEDIED THE SMOKE. THE PLANE LANDED SAFELY SHORTLY THEREAFTER.