SOURCE: Keys stup in upright position
You will likely have to open the case. There may have been some plastic stops that broke off, but keys may just be out of the pivots.
Lots of screws to take out and be VERY careful oof the ribbon cables.
SOURCE: casio privia key issue
The only way to analyze this is to open the case. You may find contaminating material has gotten in, or broken part, or key slightly out of position on pivots or pivot plastic broken.
When opening, be VERY careful of the tender ribbon cables. Have a large work surface that you can unfold the top onto. Be careful to use correct screw lengths and thread in each place you removed.
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