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Does anyone know where to find which lenders use Trans Union. I know I have read that it differs by state, but I have been unable to find any sort of lists etc.
Google Creditpulls database
The Credit Pulls Database is as good as it gets. Manually maintaining a list would be unwieldy.
Be aware that a given credit can perform multiple pulls. Generally these are more likely for borderline apps. If you other reports are in poor shape then definitely work on them.