Hello,
Download affected certificate serials for 2020.02.29 CAA Rechecking Incident
https://letsencrypt.org/caaproblem/
https://community.letsencrypt.org/t/2020-02-29-caa-rechecking-bug/114591
https://community.letsencrypt.org/t/revoking-certain-certificates-on-march-4/114864