As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMOKE COMING FROM CIRCUIT BREAKER PANEL BEHIND CAPTAINS SEAT WHEN GROUND POWER WAS CONNECTED TO ACFT. FOUND GROUND SERVICE BUS CONTROL AND A & C PHASE GROUND SERVICE BUSS BREAKERS TRIPPED. REPLACED BLOWN CURRENT LIMITERS FOR CROSS TIE RELAY T2. STARTED APU AND PERFORMED CROSSTIE CHECK. OPS CHECK NORMAL.