This article is from the Credit cards and Consumer Credit FAQ, by adams@spss.com (Steve Adams) with numerous contributions by others.
The answer is "yes" for TRW and "probably not" for Equifax and Trans
Union.
Industry practice has been that if you dispute an item, the credit
bureau ignores any documentation you send. Instead the bureau
simply asks the credit grantor for a verification (see preceding Q).
However, in the consent decree entered 10 Dec 1991, TRW promised it
will accept "authentic proof of an error (such as a bill or a letter
from a creditor)" when submitted by consumers. I don't know whether
TRW is actually doing this.
 
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