Problem(s) Encountered:

The guiding system seems not to be working well. Sometimes seems totally  stuck , and when it works the graph shows huge oscillations. I tried the standard solutions but didn''t work. The drift in the images is big.

Solutions:

Looks like the spare C/T #3 (DT2819) board installed the previous week has issues of its own.  Found that this board also controls interactions between telescope and guider.  Pulled the board out of the currently dead “spare” TCS PC and installed it.  Guiding seems much improved now.