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If you haven't order a credit report from the 3 bureaus in the last year then you can request them from annualcreditreport.com. Otherwise I would just call TU and dispute with them over the phone.
Providing a copy of your credit report as part of the dispute process is not required, but is specifically authorized, and even mentioned in the new direct dispute rules as an item that will assist a creditor in their investigation of your dispute.
You can argue that you have adequately documented the dispute without need to show that the information actually appeared in your CR, but I would just comply.
It is not an unwarranted request.