What was found
(CAN) DURING APPROACH FLIGHT ON MULTIPLE OCCASIONS THE PILOTS EHSI SCREEN WOULD POWER DOWN AND RESTART UNCOMMANDED. IN THE TROUBLESHOOTING PROCESS ALL REMOVABLE COMPONENTS WERE REPLACE WITH SERVICEABLE UNITS. A VISUAL INSPECTION OF THE A/C WIRING BY THE AVIONICS SHOP REVEALED CHAFED WIRING UNDER THE PILOTS SEAT IN THE OUTFLOW VALVE COMPARTMENT. WIRING P/N REPAIRED 9C95A22, 9C94 A22, 9C3G20, 9C32A22, 3F14A22N,ITN5A24. CHAFE PROTECTION INSTALLED ON THIS BUNDLE TO PREVENT FUTURE SIMILAR HAPPENINGS. SYSTEM TESTED SERVICEABLE AND LOG ENTRIES MADE.