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If you were the personal representative of the Estate you can send a request in writing and include your appointment letters from the Court.
Otherwise, they may not release the reports to you. You could simply send in a letter with a request and include all the pertinent information and see if they send you one.
If you go to the websites for each credit bureau, they have the procedure for requesting the reports, what information to include and the addresses in their "Contact Us" sections.
Or you can go to this link and follow the instructions for all three bureaus.