As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HTAWS FAILED FOLLOWED BY THE GNS 530 FOLLOWED BY THE TECHNOSONIC HEAD IN MEDICAL COMPARTMENT WITH SMOKE. INSPECTED WIRING AND CONNECTORS, NO VISIBLE DAMAGE. DETERMINED INTERNAL SHORT IN GARMIN 530 WHICH CAUSED SMOKE AND SMELL IN CABIN. REMOVED AND REPLACED GARMIN 530. ALL SYSTEMS OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.