What does it mean if I see some of the issues listed in the previous question?

Here are some things that typically cause those issues:

Gutter pulling away – normally this either means there is wood rot in the boards or your gutters are clogging, causing overflow, which will damage your wood and possibly your roof.
Mold and mildew – indicates moisture gathering in that area, which may mean airflow issues in the roof or soffit region.
Sagging – is normally a result of old, damaged or degraded materials, caused either by moisture, gutter overflow, clogging in the air holes, or, on occasion, wildlife making its way into the home!