Refilling a sealed hydrostatic lawnmower transmission

I bought this riding mower for cheap because the hydrostatic transmission was slipping. I found a simple and cheap way to drain and refill it. Worked great afterwards!
I am an amazon affiliate , Shopping through my link doesn't cost you a thing, but I get a small fee when you do. Thanks! amzn.to/2VKQjI... to empty and refill a sealed and unserviceable hydrostatic transmission.