What was found
AFTER SERVICING THE GEARBOX AND ON FIRST RUN THE PILOT NOTICED A CHIP LIGHT. THE AIRCRAFT WAS SHUTDOWN AND THE GEARBOX INSPECTED. UPON REMOVING THE OIL SITE GLASS THE MECHANIC NOTICED BLACK MATERIAL AND VER SMALL SPECKS OF SHINY METALLIC PARTICLES IN THE OIL. THE GEARBOX WAS FLUSHED TWICE AND EACH TIME THE PILOT RECEIVED A CHIP LIGHT. GEARBOX REMOVED FROM SERVICE DUE TO METAL CONTAMINATION AND REPLACED WITH OVERHAULED, CORRECTED PROBLEM.