FYI: I had a customer with a Partner ACS 6.0 who called me up complaining of a "clicking noise". While on the phone with them I could here the noise every 2-3 seconds. We checked to see if it was only on the CO lines but found the noise between extensions as well. They tried rebooting the system and the noise was still there. Not long after, the noise was happening so often I could barely hear the auto attendent. I checked the forum and was directed to a possible processor starting to fail. When I arrived at the site, to replace the processor I noticed boxes stored in front and on TOP of the carrier. It's amazing how well the system works with AIR FLOW!!! No new processor needed, just some direction to employees on good housekeeping.