Yamaha CLP-880M lid (key cover) dampers

I bought this Clavinova CLP880 in 1995 and it has worked superbly over the years but in the last few years the lid dampers doesn’t prevent the lid to slam down rapidly when closing it so I guess they need to be replaced. I was hoping to do that myself with the help and instructions on how to do it from knowledgeable people in here. Also, I haven’t found the damper itself anywhere on the net so the question is, is it available at all?

Thanks