5.1.1.3.1 Record and report to its administration all incidents of data corruption or loss, and steps shall be taken to repair/replace
From CLOCKSS Trusted Digital Repository Documents
5.1.1.3 - The repository shall have effective mechanisms to detect bit corruption or loss.
Both the network of CLOCKSS ingest machines and the network of CLOCKSS boxes use the LOCKSS: Polling and Repair Protocol to detect and repair corruption or loss of their content.