REPLACE THEM,do not try to fix they are going down for the count (I just did mine)Here ya go...
http://www.ebay.com/itm/281191302117...%3AMEBIDX%3AIT I have replaced them twice it is a walk in the park to replace and CHEAP and WAY BRIGHTER!! ,the old one's go dim then fail all together because they get moisture under the LED strip and start rusting and short out anyway just peal off the old one's prep the area by taking all the old silicone off and tape residue clean with Alcohol and then wire up the new and recaulk and stick them on ..EASY
you will be real happy on how nice and bright these are, too bad I could not find them in white but oh well I like the blue BLING
....ALSO my under awning lights did the same thing and I replaced them as well with blue one's