As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT 4000' ELECTRIC BURNING SMELL TROUGH OUT AIRPLANE , AFTER TAXIIN GROUND PERSONAL SAW SMOKE AND EXCESSIVE HEAT LEFT WHEEL WELL, CONFIGURED FLAPS 15 LEVEL FLIGHT. MAINTENANCE REPLACED LEFT AIR CYCLE MACHINE IAW AMM 21-52-02.