Our kit 775 also had 2.3 Ohms between terminal and the case on BOTH terminals, and we'd been using it off and on for a few days. We shorted the terminals to the case with the battery (one at a time) and now we're seeing 126kOhm between terminal and case on both terminals. Our other 775 that we were "gifted" from 3320 (The M&M's) had 3MOhm between terminals and case.
I was disappointed that there wasn't as much of a fireworks display as others seem to have experienced when we did it.
-Danny