Have you call Pentax head office and talk to them before taking the camera to those guys? What did they advice?
Looking at the JP Service solutions website, I don't see anything that shows they are a Pentax service center... looks like they are an independent company that specialize in fixing a lot of brands.
Pentax shows as one of their partners, but what does that mean!? What is their actual relation!? I doubt Pentax will sign them a check to fix their cameras... has the fix been approved to be done under warranty?
Based on that information... of course JP Service solutions will charge for something they will fix
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I fail to see how Pentax service is at fault here... I don't say they are brilliant... but don't see the connection... could also be wrong with my assumption, but based on the information at hand, I can't say otherwise.