As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO DURING PREFLIGHT THE FLIGHT CREW NOTED VISIBLE SMOKE & A BURNING ODOR EMANATING FROM THE COCKPIT CENTER PEDESTAL. THEY SHUT OFF THE AIRCRAFT ELECTRICAL POWER. AIRCRAFT REMOVED FROM SERVICE. REPLACED ACARS PRINTER. SYSTEM GROUND CHECKED NORMAL OPERATION CLOSED.