Can you take a picture of said spots? Are they hazy or a dark brownish black color. Does it look like the plastic on the inside has melted a bit? It could range from a bunch of problems.1) Dirt and a bad seal on the lamps could cause the problem.2) Using a very high wattage bulb, i.e. the blue bulbs that require 150+ watts to run when your system is meant for 55W, thus creating overheating in the lens and discoloring and burning. Those are the main two. If you could take a pic for me I would appreciate and could be more specific on the fix.