What was found
AIRCRAFT RETURNED TO PLATFORM, DURING RT ENGINE START, THE RT START VALVE OPEN LIGHT FLASHED AT 40 PERCENT RPM, N2 DECREASED TO 35 PERCENT AND RETURNED TO 50-56 PERCENT, 20 SECONDS AFTER THAT ENGINE STOPPED. AIRCRAFT WAS SENT TO THE HANGAR AND DURING MAINTENANCE REVISION WAS DETECTED METAL FLAKES IN THE RT ENGINE GEARBOX. THE RT ENGINE WAS REPLACED IAW MM 71-00-00, TESTED CORRECT.