on one of the waterfalls two of the lights are going out. i looked really closely at it a few minutes ago and it looks like there are several small bulbs that come on and off, seems the red ones and the yellow ones arent coming on and one of the green ones comes on only sometimes. when i furst turn the lights on seems to work normally, only starts after being on a while. does anyone have any experience with this system? is there some place to buy parts online, or do i have to go through a dealer? we dont have one close at all.