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In my opinion, you have no basis for dispute.
A creditor is not required to report every monthly delinquency to each CRA.
They can choose to report none, one, or all.
Lack of reporting to one CRA does not make the reporting to another inaccurate.
The FCRA only requires that what is reported cannot knowingly be inaccurate, It does not require complete reporting of all derogs.
A dispute is more likely to result in addition of all delinquencies to each CRA. I doubt that you want that....
I would presume they passed business records to heirs of the account.