Root Rot Question

[RalphJones]

Hi, I decided to repost my question from the Phal Abuse Ends Here thread so more people might be able to see it and help me out.

I have a Phal that I discovered had some moderate root rot once I replanted it. However, the rotted part is often in the middle of the root, and has good solid green root above and below it. I think maybe that when the orchid was last re-potted by someone they broke some of the roots in half and cause rot around the area.

Should I have left the whole root alone like I did? Or should I have cut right above the rotted part and discarded the healthy root below that?

Thanks,
Ralph