Tranny Leak

[MotoG5]

Went for a morning run today and after returning home found that my tranny rear out put shaft seal is leaking. Not real bad but I will have to deal with it this winter. The bike has about 17K on it and up to now I have not had a lot of trouble. Any one know if I can get at the seal from the outside or will I have to crack the case to do a replacement? As I have had few issues with this bike and my other Guzzis are all Tonti frames with the old five speed unit I dont have a lot of experience with working on it. Any information would be greatly appreciated. Oh yea, the bike is an 02' VllS naked in what I have been told is Frozen Piss Green.