What was found
WHEN REMOVING THE RT CIRCUIT BREAKER PANEL TO CHECK THE EDGELIGHT PANEL, THERE WAS ONE BRASS SCREW WITH THE TIP BURNED. MX IMMEDIATELY INVESTIGATED THE SOURCE. THERE WAS A NR 10 WIRE FROM THE AVIONICS BUSS BAR TO THE ARTIFICIAL HORIZON THAT WAS ALMOST BURNED ALL THE WAY THROUGH. THIS WOULD BE NEARLY IMPOSSIBLE TO DETECT WHEN INSTALLING THE EDGE LIGHT PANEL TO THE CIRCUIT BREAKER PANEL. THERE WAS NO MAJOR INCIDENT OR SMOKE/FUMES NOTED FROM THE PILOTS DURING OPERATION.