Mamiya 645 PD-S Meter repair

I bought a PD meter prism for a Mamiya 645 1000S. It's about 4 stops off. Anyone have experience with a repair shop they can recommend, or is repair absolutely cost prohibitive?

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bob.

You might send a email to KEH. They have repaired some of my RB67 items, but I can't say any light meter items to date. Just a thought. I did not get a response back from MAC ( Mamiya America) recently on a RB67 question so I don't know if they entertain ANY legacy repairs these days.