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Just to be clear, we are talking about an adverse TL, right? Because if it's a positive TL, you wanna leave it alone. It helps you.
If you have paper copies of your reports, there should be contact info on them. If you're using MyFico or a 3-in-1 like TrueCredit (which is what I use), there should be contact info on them. All else fails, use the contact info on their websites.
TransUnion Consumer Solutions
P.O. Box 2000
Chester, PA 19022-2000
Experian
P.O. Box 2104
Allen, TX 75013
CSC Credit Services
PO BOX 981222
El Paso, TX 79998-1222