Should have a KAF620 v-twin engine,
The main thing when identifying an oil leak is to CLEAN everything... it makes it easier to trace.
You'll have to remove the primary clutch and clutch cover, then you'll have access to the PTO oil seal. If it is leaking from the crankcase cover, you just remove the cover and scrape the old gasket and install a new one. might be easier out of the frame but it can be done in frame.