What was found
(CAN) ON DESCENT CREW REPORTED FAILURE OF THEIR ISFD. FLIGHT OPERATIONS DECIDED TO DIVERT ACFT FOR MAINTENANCE. ISFD CIRCUIT BREAKER FOUND OPEN ON ARRIVAL, P18-2, PANEL, IT WAS RESET AND THE IFSD WAS REPLACED IAW AMM 34-13-01. THERE WAS NO HISTORY OF PROBLEM WITH THE SYS LEADING UP TO THIS FAILURE.