Start with the basics, bulbs, connections, grounds, conuniutity from switches to the bulbs, power at the connectors, seeing the age i would check the resistance in the wiring also could have some corrosion issues. At least it should be an easy system no ecms or anything.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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