I had the same problem too.
There are four(4) leds for the button.
The problem seems to be with the circuit board which is on the faceplate.
I had a spare part backplane from my older CD version MFD2,
which I used to replace in my current DVD MFD2; and it worked fine.
So my advice is to get from ebay a spare faceplate only (ive seen some on ebay.de).
best of luck.