As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTICED SPARKS MOVING BY LEFT SIDE WINDOW AFTER TAKEOFF. LEFT THE LANDING GEAR EXTENDED. MADE AN IMMEDIATE RTB TO RNW 29 AND LANDED SAFELY. PARKED AIRCRAFT ON RAMP, EVACUATED ALL PERSONNEL, MOVED AWAY FROM THE AIRCRAFT. SAW SMOKE AND FELT HEAT COMING FROM LEFT SIDE AIR CONDITIONER EXHAUST VENT.