[folivier]

Does Dave Holmes in Indiana not have the compressor squirrel cage fan motors anymore? That would be a big problem.
A couple years ago a local electric motor rebuilder looked at one and said he could maybe rebuild it but it wouldn't be cheap, he said the problem was with the sealed bearings. You might have some luck finding a local shop to rebuild.
I think at some point we all will have to convert to roof airs, not looking forward to that.
My local a/c guy repaired mine once and said he might be able to find a compressor and condenser that would work. You just need to find someone willing to work on these units. Once he saw that the compressor unit could be pulled out he was willing to look at it.