As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE CONNECTING BATTERY, SMELLED AN ELECTRICAL BURNING ODOR IN THE AFT TAIL CONE AREA. INSPECTED TAILCONE FOR ANY EVIDENCE OF CHARRING OR BURNING. RAN AIR COMPRESSOR FOR APPROX 1 HOUR TO DETERMINE ROOT CAUSE OF ODOR. NO ODORS PRESENT AT THIS TIME. WORKED IAW MM 21-52-00. INSPECTED ELECTRICAL COMPONENTS AND FOUND NOTHING LOOSE OR EVIDENCE OF DAMAGE.