What was found
DURING CLIMB-COPILOTS SIDE EHSI FAILURE ALONG WITH ELECTRICAL BURNING FUMES. CMPST MODE OK 2-3 MINUTES LATER, RETURNED TO NORMAL. THE COPILOTS EHSI, PN 066-03125-2500 WAS R & R IAW AMM 12-A-34-26-02-00A-920A-A NO DEFECTS NOTED. THE ACFT INSTRUMENTS, BEHIND INSTRUMENT PANEL, CIRCUT BREAKER PANEL, FLIGHT DECK AREA WIRING AND GROUND BLOCKS, UNDERFLOOR WIRING FOR DEFECTS OR ANY EVIDENCE OF BURNING, NONE FOUND. THE ACFT WAS RELEASED FOR A CHECK FLIGHT, ALL INDICATIONS NORMAL, NO DEFECTS NOTED DURING ANY PHASE OF FLIGHT.