As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE AT FL350 HAD STRONG BURNING SMELL IN COCKPIT. AT ABOUT THAT TIME CAPTS VSI BLANKED. ODOR SUBSIDED AND 5 MINUTES OR SO VSI DISPLAY RETURNED. CONTINUED TO HAVE VERY LIGHT BURNING ODOR. SEEMED TO BE MORE OR SLIGHTLY STRONGER ODOR WHEN ENGINES ACCELERATE. NO C/B`S POPPED. REMOVED CAPTS VSI INDICATOR AND FOUND IT TO BE VERY HOT WITH A BURNING ODOR COMING FROM INDICATOR. REMOVED AND REPLACED SAME.