'Just finished replacing all my contacts, and everything went smoothly and when I powered back up, all the notes play properly.
Couple of things to beware of. The rubber contacts need to be put on correctly, for if they are turned around, the notes will play at full loudness all the time.
You must look very closely for the queue. It is a very tiny little rubber nib, that are on one side of the strip, and not on the other side. I have marked them in the photos, so you know what to look for.
Make sure you make note on the old strips that you are taking off, which way they face.
Also, there is a 3 note strip for the lowest 3 notes on the keyboard. I did not replace mine. I don't play those notes all that often. If you need to, purchase an extra 12-strip and modify it into the "3". Or, take your old 12-strip at the top end of your keyboard, and cut 3 notes off from that, since those, too, should not be played very often and may suit you fine.