Your going to need a factory service manual, I got mine thru "cyclepedia" an online manual service. I have both hard print copy and the online version, they also offer a problem consulting service once you join. Mine was 100 for both orint and online lifetime. You will need to go thru a dealer for parts. If the case is actually broken you might just consider a whole new engine/trans assembly. Would be a lot less labor! Kymco USA has a parts break down with part numbers, you will need to join for access but it is free. I hope your frind is going to step up cause this isnt gonna be cheap. Another reason I carry full coverage ins just like my car. Find a good dealer to help you out. Even if not local, UPS ships everyday! Good luck and keep us posted