Was this ever working? There was one issue I saw a while back where the interface was wedged. I.e. if you do a "show interface service 0/0" (or whatever the interface number is from the router), you would see an "input queue" of something like 76/75. Only way around was to reboot the router (although there is a permanent fix with an IOS upgrade). If that's what it is, I can probably dig up the defect ID and give you more specifics.
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...