What was found
DURING TAXI OUT, AND DURING ENG START N2 STAGNATED AT ABOUT 26%. SHORTLY AFTER THE START WAS ABORTED. THE ABORTED START CHECKLIST WAS RUN, AND N2 WAS DECREASING AT THIS POINT. UPON ENG RESTART N2 NEVER SPOOLED UP. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE REMOVED AND REPLACED RT ENGINE STARTER AND OPS CHECKED GOOD IAW AMM 71-11-04, 78-31-00, AND 80-11-01. AIRCRAFT RETURNED TO SERVICE.