As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED AIRCRAFT OPERATING WITH BATTERY ONLY AS AN ELECTRICAL BURNING SMELL WAS NOTED IN THE COCKPIT. MAINTENANCE FOUND THE AIR CYCLE MACHINE SEIZED. PILOT PROCEDURE IS TO SHUT DOWN BLEED SYSTEMS AND THEN GENERATORS UNTIL SMOKE CLEARS.