Neostylis roots, healthy or unhealthy?

[Paul Mc]

Being a newbie to neostylis', I'm unsure what's healthy and what's not. I know with oncidiums, that brown doesn't mean bad necessarily. But some of my neo's roots are paperlike, or dangling by a thread. I'm assuming they are bad. Some of the dried, shriveled roots have ends that are still plump and dark green. Do I need to cut these roots off as well?