Want someone to refurbish 5200 controllers

I'm testing 5200 systems and controllers at the moment, and I only have a few that work 100%.  I have a pile of others here that mainly have keypad/fire button problems.  Does anyone here refurbish 5200 controllers?  I know I could do it myself, but I'd rather just mail out a bunch of controllers and pay someone to send me back nice, working controllers.

Thanks!

..Al