So i finally got my 99 yz400 back, and have went riding twice since. I've noticed there is a pretty good leak from the front right fork tube, so i asked my mechanic buddy about it, and he said they are nitrogen and oil filled and that he cant do the seals they need to be sent off somewhere. Is this true? i thought you could just replace the seals at the bottom of the tube? if so, how hard is this?