What was found
FIRE EXT WARNING LIGHT ILLUMINATED ON CAD DISPLAY. AFTER INSP OF A/C FOUND, CHAFED WIRES. THE WIRE'S WERE LOCATED JUST AFT OF THE CO-PILOT'S SEAT. IN THE CABIN OVERHEAD, JUST INSIDE OF CABIN DOOR AREA. THEY WERE CHAFING AGAINST AN AIR CONDITIONING LINE. THE WIRE'S WERE REPAIR AS REQUIRED, AN TY-WRAP IN SUCH A WAY THE CHAFING AGAINST THE A/C LINES WOULD NOT HAPPEN AGAIN. GROUND FUNCTIONAL CHECKS AS WELL AS A, A/C GROUND RUN CHECK OF THE AFFECTED SYS WAS DONE. NO DEFECT'S WERE NOTED AT THAT TIME.