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If you do receive a modification, your credit score may not be affected at all, depending on how the modified mortgage is reported to the credit reporting agencies.
http://cdia.files.cms-plus.com/Metro2/MortgageHomeEquityReportingGuidelines.pdf
If your modification results in a new account number and/or a new open date of the loan, this may appear as a new tradeline on your credit reports and thus have an impact on your score.