CFX-200, help needed

Hi,

 

I just got this CFX-200 for $50...

 

 

(I'm not sure why, but in my country they are cheap) and it's working great, even its little backlight... BUT 2 buttons are not so responsive (1 and exe), I have to press them a bit harder to make them work.

 

So I have some questions...

 

1: What do you think is happening? just dirty or some module malfunction?

 

2: How do I clean it?

 

3: Well, my idea is to strip it down, then clean both, the metal parts and the module, but how do I clean the metal parts?

 

And 4: What other watches have the same kind of buttons? I need to replace some of them.

 

thank you very much!

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