Second that about putting in a fresh damper plate, that's a wear item. Also new input shaft and output shaft seals. Input shaft seals seem to not last as long as rest of the gear and no fun dumping a sump load of fluid into the bilge, then burning up clutches.
Check reduction gear parts for wear. Check clutch condition. No need to rebuild, just clean up, inspect and reseal. These are robust gears and worth freshening up.
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