"Plan sponsors or fiduciaries should: [1] prepare or update written plan procedures ... to include the 'best practices' set forth in the DOL guidance; [2] review the DOL's new 'red flag' checklist, and take action to eliminate any red flag items that could apply; [3] confirm that plan recordkeepers and third-party administrators are implementing and following the plan's procedures ... [4] clean up data and file feeds to their recordkeeper/third-party administrator; [5] contact participants (both current and terminated/retired) and beneficiaries on a periodic basis to confirm or update their contact information."