I bought a used YDP-144. The original owner said it worked great for years and then suddenly had some keys stop working. They had the electronics cleaned and the problem went away, but they got a new piano in the meantime.
It worked fine for the first week or so after I got it, and then all of the C and F# keys intermittently stopped working. When it stops working, it’s all of the C and F# keys, and it can stay in a non-working state for days or weeks. When it starts working again, it can keep working for days or weeks.
Any thoughts on where the problem is likely to be?
Thanks in advance!!