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Have you checked previous threads? http://ficoforums.myfico.com/t5/forums/searchpage/tab/message?advanced=false&allow_punctuation=false...
Unfortunately, those that have fixed their credit don't seem to come back here, so searching the forum will probably get more results than waiting for an answer that might never materialize. I suggest looking at various good will letter threads. You need to make the letter personal to you - do not copy any letter word for word instead use it as you would a template for a resume.