If these are the 3d plastic letters, as many of us have, these are clear plastic with a gold foil on the back. The foil starts to delaminate and make the latter look splotchy. I managed to replace mine in 2010 when i could still find all the letters. If it makes you feel any better the letters start this very quickly and goin into my 3rd season with the new letters I realize i shouldn't have bothered. They certainly look better than they did, but you couldn't tell I replaced them recently anymore.
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