Phase one DM28 release lever broke off

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I have a real nice DM28 with 18K shutter count on my Mamiya 645 DF body.. Works great but I went to remove the back from DF body and the Lever was STUCK. So I lubed it with tiny dropper of mineral oil and it started to loosen and near perfect, and that's when it broke off...??? I can stick back in and push to release the back but that piece falls right out..
not sure if previous owner glued back on and the oil dissolved glue? Please help, I am sad, where do I fix it? I am mechanically inclined and could do, but don't know the ins and outs to disassemble

[Ulf]

Hi

Our recommendation is of course to bring it to a Mamiya-Leaf partner who can arrange for service.
http://www.mamiyaleaf.com/partners.html