As they say in the pukka English ex-colonies, "vale" - your RD1 has had its time, and other than buying another used body (and maybe risking the same sad end as your current one has just reached), there really isn't much point in spending big money to repair an ancient photo machine.
Which of course isn't to say you should make enquiries as to whether it can be repaired. Someone out there may be able to pull a rabbit out of a hat for you, and give it a little more life. So as they say in Britain, best of.
Lucky you to have an M6 AND an X100!! Me, my Contax G1 kit sits quietly in my camera cabinet, awaiting its next (sadly irregular) airing and outing with some of my fast-dwindling stock of B&W film in the darkroom fridge. So yes, get stuck into that film before it turns into so much colourful dust...