What was found
WHILE PERFORMING OTHER MAINTENANCE A FUEL STAIN WAS NOTICED BETWEEN THE SECOND AND THIRD COOLING FIN AFT OF THE FUEL INJECTOR ON THE NR 6 CYLINDER OF THE RT ENGINE. THIS CONDITION PROMPTED A CLOSER INSPECTION OF THE ENGINE RESULTING IN THE DISCOVERY OF SIMILAR STAINING ON THE NR 1 AND NR 5 CYLINDERS. EACH CYLINDER WAS INDIVIDUALLY PRESSURIZED AND LEAK CHECKED WITH A SOAPY WATER SOLUTION, NR 6 CYLINDER PRODUCED LARGE BUBBLES. THE CYLINDERS ARE ECI CASTING NR AEC65385 AND THERE WAS (A) STAMPED ON THE ROCKER BOX FLANGE WHICH REQUIRES NO FURTHER ACTION IAW AD 04-08-10. BY THE PILOTS STATEMENT THEY BELIEVE THERE IS APPROX. 1000 HOURS ON THESE CYLINDERS. RECOMMEND THAT A GOOD VISUAL INSPECTION BE PERFORMED AT 10