A new viewfinder prism/rf mechanism and the repair labor will cost you around $375USD.
That should include labor, a CLA on the camera, and the new part itself.
If you're lucky they may have parts available and might be able to do it cheaper, but it's unlikely they'll have that specific part for your specific camera, in my opinion.
Expensive repair but the camera will come back with a brand new bright rangefinder and perfectly adjusted.
If the chip doesn't affect your photo taking abilities I wouldn't even bother getting it fixed.
Epson R-D1, Ricoh GRD III, Rollei TLR's, Lots of others