As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HSI SCREEN WENT BLACK FOR A LONG PERIOD, WITH A SMELL OF BURNING. THE SCREEN CAME BACK UP WITH NO CREW ACTION. REMOVED CAPTAINS EHSI AND CLEANED INLET SCREENS. REINSTALLED CAPTAINS EHSI. OPS CK NORMAL. REF TO FIM 34-22 FT 806 FLAG NOTE 2.