How to Replace LED Light Bar behind Waterfall?

[flipflopper]

My new, used 2013 Sundance 880 Cameo has a great lighting system. But the LED light bar behind the waterfall has lost most of its blues, one green, and other lights flicker from time to time. I'd like to know how one goes about replacing these? I believe I found the replacement part here: http://www.pool-spa-supplies.com/sundance-spas-light-led-for-waterfall-niagara-2013-6560-177?utm_source=google_shopping&gclid=CInO7bWo9cwCFdFZhgod8k8FMQ.

Any ideas for how I do this? How do I get the old one off without damaging anything? What kind of sealant do I use when I put the new one in?