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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@HilmarSt
Sorry for the alarm, here's the "all-clear signal":
The "holes" were only visible with a strong magnifier, there's no possibility for me to photo it.
But with the help of my fingernail it turned out that the "holes" are bumps instead!
So again sorry for the false alarm.
Maybe the Silver Conductive Paint can prevent the corrosion anyhow?