I have a musical Yamaha keyboard (model Yamaha psr-e333).
It has recently stopped working properly, with some keys not sounding out at all, and some keys that are pressed activating the wrong notes.
I am not sure how this has happened but I suspect a friend spilled alcohol on it (as I have noticed a sweet smell and some sticky residue underneath the keys).
Does anyone know how to fix it/can link to resources to fix it? Thank you!
And if you have knowledge on keyboard repair, how much would it cost to fix?