It depends on the reports in question, but the easiest way to customize reports (with minimal customizeability)... Edit the report. If the edit button is disabled, just save-as to a new report. Any available fields in the box on the left can be moved to the box on the right.
That only takes a few minutes, so if the fields are all available then you're good to go. If not, that's when you need to dig into the report definition customizing which is a bit more time consuming.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...