I believe one of mine had that and if I remember it was actually a trace on the board for the white channel that was blown. Check for brown marks on the board, i jumpered over the break with some solder and wire. Not saying this is the best fix, but it was temporary until I got my new lights. If you are really interested in reviving the old dog, lol. I have probably a whole fixture and my spare fixed board you can have to try and fix it. May just be parts haven’t powered it up in over 4 years to even know the state.
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