Under Audit Criteria look for Surface Enhancement (AC7117)
Under Handbooks & Guides look for SE Audit Handbook
Under General Nadcap User Information / Audit Information look for Supplier NCR Response Guidelines.
Under 2018 Auditor Conferences Agendas and Presentations look for 2018 Auditor Conferences Agendas and Presentations >> NMSE - 2018 >> SE - Top NCRs
It does not appear that 2019 Top findings were added. You might want to look back at previous years as well.
Hope that helps,
Good Luck!
-Walter