So I am not an engine guy but I love my motorcycle. I have been riding it for quite some time and did the warranty on the bike that was required from Yamaha about 3 months ago. When I got the bike I did not readily see a problem but now have noticed that I have a slow oil leak. I was told by the shop that it's coming from the counter shaft seal. I do not know where this is located on the bike at all but the leak was present at the very bottom of the engine coming from the left-hand side. I could not see its origin due to the fairings. I am being told that in order to get to this leak the engine needs to come apart. I am very worried about this seeing as the bike is not even a year old. Should I be worried and trust the shop? Or are they just looking to bill out warranty work?