What was found
PILOT REPORTED SPARKS COMING FROM UNDER THE INSTRUMENT PANEL UPON ENERGIZING THE IGNITION SWITCH. UPON FURTHER INVESTIGATION, FOUND THE WIRE BUNDLE FOR THE CIRCUIT BREAKERS ADJACENT TO THE IGNITION SWITCH WAS TOO LONG AND A WIRE IN THE BUNDLE HAD CHAFED ON AN IGNTION SWITCH POLE EVENTUALLY ARCING. WIRE BUNDLE WAS RE-SECURED. OTHER FLEET AIRCRAFT OF SAME MODEL REVEALED ONE OTHER AIRCRAFT WITH THE IDENTICAL PROBLEM, WHICH HAD NOT CHAFED THROUGH. (X)