Hi Joe,
We still want people to be able to visit the subdomain and all its pages - we just don't want it to appear in search as the pages are user-generated and not meant for the general public. However, many of the backlinks point to those pages since users are getting their clients to sign electronic waivers on the subdomain.
So my question is, if we deindex the subdomain without 301 redirects, will the value of links pointing to that subdomain provide value to their primary web address?