Those are simple buttons as I said. You can buy them in any electronic components store. But those come in different thickness of the green part, so maybe you should extract it (desolder) and take it to the store to buy the same piece.

Upload an image and copy de link to see the piece.

Well, It all depends on the cost of repair services of your country. An MPK25 nowadays its cheap, so maybe you are right. I'd love to repair that but i'm in South America (Perú).

Hi Jasper, a service technician here. Octave buttons are simple buttons. Have you tried to change them?. If that doesn's work, maybe it is the IC that picks up the information that it's not working. Maybe it needs some cleaning or solder maintenance or an IC change. I don't remember exactly but i believe it is a multiplexer, router or a similar digital IC. It's not complex to fix that problem. Tell me how it's going.

My MPK61 screen works but just a for a time, after some hours the white letters fades to dissapear and left only the blue screen in blank. Anyone with this problem?