Section 138.510 - Required attendance(a) The TPO and the owner or managing operator may be required to explain or otherwise demonstrate areas of the TSMS to the Coast Guard if there is evidence that a TSMS, for which a TSMS certificate was issued, is not in compliance with the provisions of this part. The Coast Guard may require a third party's attendance at the vessel or the office of the owner or managing operator for this purpose.(b) The Coast Guard will not bear any of the costs for a third party's attendance at the vessel or the office of the owner or managing operator when complying with this provision.