Sad to hear about this Rikki.
I know that some plastic will behave like you describe if used some sort of chemicals when cleaning.
Also if it has been under the hot sun too long. But as you, I haven't heard about such issues regarding keyboards.

Btw, are you selling to get room for Genos, or just scaling down to keep PA4X?
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)