As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT THERE WAS AN INTERMITTENT ELECTRICAL BURNING SMELL, NO SMOKE, UNIDENTIFIED SOURCE. PREFORMED AIRCRAFT OPERATIONS CHECK AND GROUND RUN FOR 16 MINUTES. PUT UNDER ELECTRICAL LOAD AND ALL AIR CONDITIONING SETTINGS. COULD NOT DUPLICATE THE SMELL.