What was found
(CAN) DURING TAKEOFF ROLL, CREW RECEIVED A BLUE CAS MSG, LT ENG FUEL BYPASS. UPON CONSULTING QRH & VIEWING FUEL PAGE, IT WAS DETERMINED THAT THE LT FUEL FILTER WAS BEING BYPASSED, AMBER FUEL FILTER ON FUEL PAGE. INITIALLY THIS ONLY HAPPENED AT HIGH POWER SETTINGS. CREW DECIDED TO RETURN TO BASE & HAVE MX LOOK AT IT. CREW HAD TO HOLD AT 6000 FT & BURN OFF FUEL TO BE BELOW LANDING WEIGHT. THE CAS MSG ENDED UP BEING ON ALL THE TIME. INSPECTION OF THE FUEL FILTER CONFIRMED VISUALLY THAT DEBRIS WAS BOTH WITHIN & ON THE EXTERIOR OF THE FILTER PLEATS. AIRFRAME FUEL SUMPS WERE VERIFIED CLEAR OF WATER OR FOREIGN SUBSTANCE. INITIAL INSPECTION OF THE FILTER INDICATED PIECES OF PRC, FIBROUS MATERIAL & CLEAR PLASTIC FILM MATERIAL. RT FUEL FILTER WAS REMOVED FOR INSPECTION AS WELL REVEALING MUCH OF THE SAME TYPE OF FOREIGN MATTER ONLY IN MUCH SMALLER VOLUME. FUEL FILTER & FUEL SAMPLES ARE BEING SENT FOR ANALYSIS.