What was found
(CAN) RT CHIP DETECTOR LIGHT ILLUMINATED AFTER TAKEOFF. CREW IMMEDIATELY ENTERED CIRCUIT AND RETURNED TO POINT OF ORIGIN AND LANDED. RGB CHIP PLUG WAS REMOVED. CONFIRMED METAL CONTAMINATION. FERROUS FLAKES ABOUT 2-4MM-SQUARE. RGB FINGER SCREEN REMOVED. NO CONTAMINATION NOTED. OIL FILTER ELEMENT REMOVED. BLACK SLUDGE AND SIGNIFICANT FERROUS FLAKES PRESENT. ENGINE AND PROP REMOVED - SENT FOR ASSESSMENT.