As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN FO FIRST ARRIVED AT THE ACFT, NOTICED THE BATTERY MASTER SWITCH WAS LEFT ON. ELECTRICAL ODOR WAS PRESENT. GPU PLUGGED IN BUT NOT SELECTED. REMOVED AND REPLACED THE MAIN BATTERY AND APU BATTERY. ALL OPS CHECKED GOOD. REMOVED AND REPLACED THE LEFT DCPC PRINTED CIRCUIT BOARD 1 IAW AMM 24-62-17, OPS CHECKED GOOD. PCB SHOWED SIGN OF BURNING.