Studio Color "S" pan issue

Hi, I'm looking for some help. I have a Studio Color "s" series that I have brought back from the dead and have one with a pan issue. When the unit is turned on it homes w/ no errors, but when I put it in test mode the pan is slow. As the test goes from pan1 to pan 2 to pan3 it does not make it to each position until after the next position is displayed. The encoder appears to be working alright, when stopped if I move the yoke, it returns to the position it was at. I have had other logic boards in this unit with the same results. Also I just replaced the pan connector at the logic board. I would assume it is a bad pan motor, but I know what happens when I assume... Thanks.:confused:
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