My HP41CV just arrived. Cleaning tips?

[Trond]

I received the new 41CV calculator. It seems to work fine, and is nearly mint-looking. There is one annoying thing though: the buttons 1 and 2 are considerably less sensitive than the others. The other buttons go in with a loud "click" very easily, while 1 and 2 sometimes don't register, I feel more resistance, and there is less of a click. Is there an easy fix to this? Am I being overly picky here?