As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE A/C WAS POWERED W/ EXT PWR, ALL LIGHT SWITCHES WERE ON. THE CABIN SMELLED OF SMOKE. THERE WAS A CLOUD OF SMOKE IN THE COCKPIT. TURNED OFF ALL SWITCHES, POWERED DOWN THE A/C AND ORDERED ALL CREW OFF OF THE PLANE. FOUND SHORTED WIRE TO R BLD AIR LEAK C/B P13. REMOVED AND REPLACED ALL BURNED WIRES IAW WBM 20-20-10 AND REMOVED AND REPLACED C/B P13. OPS CHECK GOOD IAW SAAB AMM 36-23-00 P/N MS3320-5.