What was found
(CAN) WHILE PERFORMING A SCHEDULED MINOR INSPECTION OF THE INSTALLED ENGS THE LT ENG FUEL FILTER WAS FOUND WITH A SUBSTANTIAL AMOUNT OF DEBRIS. THE DEBRIS WAS FOUND TO HAVE COME FROM A FAILED AIRFRAME BOOST PUMP. THE FUEL BOOST PUMP WAS R & R WITH AN OVERHAULED EXCHANGE UNIT, THE FUEL TANK AREA WAS CLEANED AS REQUIRED, FUEL LINES FLUSHED OF ANY REMAINING DEBRIS & A NEW ENG FUEL FILTER WAS INSTALLED. NOTE THAT THE ENG INSTALLED FILTER IS THE ONLY FILTER, NO AIRFRAME FILTER INSTALLED ON THIS ACFT. BUT THE ACFT IS EQUIPPED WITH A DIFFERENTIAL PRESS SWITCH TO NOTIFY THE CREW OF AN IMPENDING BYPASS. THE BYPASS LIGHT WAS NOT ANNUNCIATED BUT RATHER THE DEBRIS WAS VISUALLY FOUND WHILE COMPLETING THE SCHEDULED INSPECTION.