Keyboard right shift key problem

Hi I’m still using the old a1314 keyboard. Recently the right shift key doesn’t work with the keys y h n and ? only. When paired to MacBook, the MacBook keyboard is fine but the shift on a1314 is problematic. When checking accessibility keyboard, all ok but a1314 problem is still the same. Any idea if my keyboard sounds as if it’s beyond fixing and need expert repair services. I’m still hoping to fix it.