2006 THOMAS/FREIGHTLINER SCHOOL BUS CAUGHT FIRE AND BURNT WHILE PARKED. INVESTIGATION FOUND FIRE ORIGIN FROM FLOOR MOUNTED BATTERY CABLES TO THE LEFT OF DRIVER'S SEAT. FURTHER INVESTIGATION INTO NINE SIMILAR BUSES IN THE FLEET FOUND HEAVY CORROSION AT THE BATTERY CABLE ISOLATORS IS OCCURRING WHICH CAN RESULT IN SHORTING AND FIRE. *TR