As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT BEING POWERED BY APU. ALL DROPPED OFF WITH APU STILL INDICATING AVAILABLE - STRONG ODOR OF ELECTRICAL SMOKE IN COCKPIT. R & R GAPCU-(GROUND AUX POWER CTRL UNIT) IAW AMM 24-41-34-400-001-B. CHECKED GOOD IAW AMM 24-41-00-740-002-B.