46 CFR 139.165: Documentation.

(a) Each TPO must retain the results of each survey or audit conducted under its approval, including:

(1) The names of the auditors and/or surveyors;

(2) The results of each audit or survey conducted; and

(3) Documentation showing continuing actions relative to an audit or survey, such as resolution of deficiencies and non-conformities.

(b) Each TPO must also retain the results of audits of their organization conducted by the Coast Guard.

(c) Records required by this part must be retained for a period of 5 years.