I tried the putty over the icons idea, alot of the IR bleeds through, this is not a solution.
I then tried unplugging one of the wires going to the sub-board, this proved to be not a solution.
I used the method suggested by TME, cutting the board traces. I had to puzzle over where to cut the traces.
As TME mentioned, only 2 cuts are required, one on the top and one on the bottom. To identify where to cut, look closely at the board and you will see + and - near the IR LEDs. The cut needs to be made on the thin trace leading to the + side of the top pair of LEDs and to the + side of the bottom LEDs
Al