Thanks for the info. #`1 and #2 would apply to both printcores, correct? As I said before there is only a problem with printcore 2.
1. The Z limit switch looks clear - nothing blocking it.
2. This would change the level of BOTH printcores, which does not help. Printcore 1 prints just fine. I did not change the screws.
3. I reinserted 2 and it clicked into place. The problem still exists,