I have an LED light system in my old Marquis 660 (2010) and had to replace all the light lenses and about half the LEDs. These are single LED, not the multiple type shown in the previous post, but probably the same standard type of RGB LED. Mine works as you described, there is a master controller and all the LED daisy chain off the controller. It has several modes that change as you switch the power on and off rapidly. I used standard RGB LED to repair the broken ones. I simply cut the harness back and soldered in the new LEDs, worked exactly as the originals. It's all in the controller unit. I searched all over the internet to find info on that controller, but there is NOTHING. I just made some assumptions and experimented to figure out how it all worked. Cost well under $10 to fix, but plenty of time to dig the harness and LED out of the foam insulation. the foam spray was the most expensive part since I used 4 cans.