As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VISUAL SMOKE EMITTING FROM CAPTAIN'S SPEAKER ON POWER TRANSFER TO GROUND POWER UNIT. DURING A DETAILED VISUAL INSPECTION OF CAPTAIN'S SIDE CONSOLE, DETERMINED THE SOURCE OF THE ODOR AND SMOKE COMING FROM CAPTAIN'S SPEAKER IAW AMM 20-60-01. REMOVED AND REPLACED THE SPEAKER IAW AMM 23-51-02. OPS CHECKED SATISFACTORY. NO FURTHER DEFECTS WERE NOTED. AIRCRAFT RELEASED FOR SERVICE.