Upon receipt of a report of overdraft on or dishonored instrument drawn on an attorney trust account, Bar Counsel shall contact the attorney or law firm maintaining the account and request an informal explanation for the overdraft or dishonored instrument. The attorney or law firm shall provide any records of the account necessary to support the explanation. If Bar Counsel has requested but has failed to receive a satisfactory explanation for any overdraft or dishonored check, or if good cause exists to believe that an attorney or law firm has failed to perform any duty under these Rules, Bar Counsel may secure compliance with these Rules by appropriate means approved by the Commission, including application for an audit pursuant to Rule 19-731 (Audit of Attorney Accounts and Records).