Personally, I would want to pull the primary cover (derby cover and cam chain inspection cover as well) and eyeball the condition of the fluid. When you drain it, make sure you use a clean container so you can check to see if it is pale amber (as it should be), brown or going to black, and smell should be like plain gear oil, no roasting almond or stong burnt smell, measure amount of fluid taken out (approx. 1 quart)...was it run DRY?, what deposits are lying in the bottom, (should be none) and how much metal filiigs drain plug magnet collected (very little). Maybe someone even put the wrong fluid in, like ATF/Dextron...but at least you will be able to determine visually if everything in there is fine.