This is a commen problem, I have known it to happen on 4 units. The cure for this is simple. Go to the hardware store and get a circular file. Remove the plexyglass front. Carefully file keeping the hole round a bit at a time. Replace the plexyglass - screw it back in - to see if the buttons are free. When finished fileing, cover the filed area with black magic marker - it won't show.
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