I am having isues with a tn464 hw13 fw 24 that has intermintent errors. The provider claims nothing on their end. So far I have swapped the board with a known good circuit and also swapped the csu with the same circuit. This was after I ran a span test to a hard loop at the smart card location from the pbx. I do notice when the board is busied out I still see intermintent errors in the log. Would this mean the issue is the pbx since the board is busied out?