uv in all 4 the board....so i think they are in series and just one led is not working....the royal blue in two of 4 board could be also in this case they are in series.....probably just replacing a puck i could solve but dipend if i find it in the market....for this reason just asking if someone knows the led part number so i can order and replaceAre those whole channels out or just a few bulbs? I'm not too familiar with that fixture but it could be a driver. Or it could be easier to replace a whole led board than single bulbs. Also depending on how it's wired a single bad bulb can cause others to not light up as well. Just food for thought.