Yamaha CLP-350 with 2 permanently stuck keys. Economically repairable?

I’ve just acquired an old Yamaha Clavinova CLP-350 from someone who was throwing it out. It’s fine apart from two adjacent black and white keys (bottom F/F#) which are permanently depressed and not working at all. My guess is that they’ve had something heavy fall on them! Does this sound like something that's economically repairable?