As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ODOR & BURNING SMELL WHILE WAITING TO BOARD ACFT. CREW STATED APU WAS TURNED OFF AFTER ELEC GND POWER ESTABLISHED. PACKS OFF PCA ATTACHED. NOTED SMOKE FROM APU COMPARTMENT. FOUND BURNT APU STARTER LEAD WIRE. REPLACED APU HARNESS IAW 49-40-03 & COALESCENT BAGS IAW 21-20-02. THE ACFT WAS GNDED.