2Keys dont work anymore. Piano AP-470

[sypie121]

Hello,
I have a Casio Ap-470 and I have the problem that 2 buttons, namely the A and A sharp buttons, no longer work properly. The two buttons are pushed down a bit, so a little further down than the other buttons, I can't pull them up either. They still make a sound, but it is uncomfortable to press them, and they also make a very strange extra sound.
I'm uploading a video for people to hear and see. Anyone know how to fix that? Would be really grateful for help.