Huachipato

I did a search in reference to this specifically. I have a problem where the LCD itself doesn't seem to work properly in darkening portions of the number, so although it works fine, I can't tell is it is set to 70 or 75 or 76 or 78 for example. Is this something that may just be a dirty connection somewhere? Anybody else have this issue?

If the only solution is to replace it - where can replacements be found at?

Not really an issue - just kind of annoying.