What was found
(CAN) ENGINE CHIP LIGHT ILLUMINATED DURING FLIGHT. OIL CHANGED, CLEANED DETECTORS, CHANGED OIL FILTER, NOTHING FOUND IN FILTER, AFTER GROUND RUN 30 MIN DETECTORS CHECKED AND FOUND CLEAN. AFTER 1 HR OF FLIGHT THE CHIP DETECTOR SIGNALED CHIPS AGAIN. ENGINE BEING SHIPPED BY CUSTOMER FOR REPAIR.