HP41CV key problem

[Trond]

I have an almost-mint HP41CV. There is one thing that bugs me: one row of buttons X, 1, 2, 3 all sometimes miss a stroke, feel different, and don't say "click" when I press them. They do work though, I just have to be careful. Is there any virtuoso HP-calc-repairsman who can fix this, or should I just forget about it?