I think I would try the gasket. Gasket and some oil would be a lot less than $200 and the aggravation.
I thought so too until I called the factory about the procedure. Seems you have to drop the entire rear end after pulling the axles out....independent suspension. I'm not set up to do anything like that; jack the rear end up, block the front and maybe bungee the front brake handle...don't want the bike rolling forward, remove the wheels then split the CV joint attachment point on the axle and pull the axles. Next, unbolt the rear axle stabilizers that keep the axle from both twisting and becoming out of square to the frame, then with a jack under the differential you unbolt it from the rest of the undercarriage and lower it. If done in the garage, all this is done on your back under the bike with limited room to move around. The next morning, you call 911 cuz you can't get out of bed.