6 C.F.R. § 5.26
(b) Component responses. Within ten working days of receiving a request for amendment or correction of records, a component will send the requester a written acknowledgment of its receipt of the request, and it will promptly notify the requester whether the request is granted or denied. If the component grants the request in whole or in part, it will describe the amendment or correction made and will advise the requester of the right to obtain a copy of the corrected or amended record, in disclosable form. If the component denies the request in whole or in part, it will send the requester a letter signed by the head of the component, or the component head's designee, that will state:
(f) Records not subject to amendment or correction. The following records are not subject to amendment or correction: