As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXI IN TO STL HEARD ELECTRICAL RELAYS CYCLING OFF AND ON AND THEN SMELLED SMOKE AND A LIGHT HAZE WAS IN THE COCKPIT. AS THE RELAYS WERE CLICKING STALL WARNING AMBER LIGHT FLICKERED OFF AND ON. REMOVED AND REPLACED LANDING GEAR ACCESSORY UNIT REF MM 32-00. PERFORMED VISUAL CHECK OF WIRING IN COCKPIT AND FOUND NO IRREGULARITIES. PERFORMED GROUND OPERATIONAL CHECKS PER MM 31-26-0.