Does anyone test whether a recordkeeper’s information about compensation from investment funds is correct?

If a recordkeeper’s compensation includes “revenue sharing”, 12b-1 fees, shareholder-service fees, or other compensation from investment funds, a sponsor/fiduciary’s informed approval depends on complete and accurate information about the compensation the recordkeeper receives from the investment funds.

Does anyone use a CPA firm or other means to test the accuracy of a recordkeeper’s reporting or disclosures about compensation from investment funds?

Any thoughts?

Without some auditing, how would a plan's fiduciary discern whether a recordkeeper's disclosures about the compensation its receives from investment funds is accurate?