.
Don't even think about "selfrepair" !
Your warranty should cover this issue, but maybe not if you try fix yourself or do things who cause even more damage.

You most contact your dealer as soon as possible for agreement to return the keyboard for a replacement or repair.
Not much fun when such things happens, never the less, shit does happens, and Ketron customers seem to get some more of it than others......

Good luck, hopefully you're connected and playing real soon.

Cheers
GJ