I see 2 possibilities:
1) Try to repair it. I would disassemble the reader and then put it together. Sometimes 'rattling' on a system repairs it.
2) Try to cope with 2 buttons less. Best way is to use PRS+ and alter button-functions over options. So you could use the left 2 buttons instead of your death right ones. No big deal and much help. Try it out!
Additionally you have the possibility to use long button-pressure-functions. So you can assign to 3 buttons 6 functions. That's one more than when all 5 buttons are working without PRS+.
A.
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