Why does my washer Drum not rotate during fill, wash or spin?

This is for a Kenmore Elite HE3 Front Loading washer, Model 110.42822203. My washer does not rotate the drum either in wash or spin modes. Washer fills, and drains through the cycle fine; just no drum rotation at all.

I have seen no error codes. I have run the Diagnostics and it goes through C:00 through C:08. But at C:04, C:07 and C:08, the drum does nothing (it is supposed to rotate) during those steps.

I also cleaned the filter trap for good measure. It had only a little debris; not clogged at all. Other things I have tried: I checked the resistance of the motor across pins 1-2, 1-3 & 2-3 and results were 6.x ohms (which is OK per the troubleshooting guide). I disconnected and reconnected all connections to the motor and motor control units. The motor control unit and motor have no visible signs of distress. The washer cycles completely through the diagnostic procedure without a failure code, but the drum does not rotate/agitate/spin. It fills with cold and hot water and drains when it is supposed to, but no drum action. The drum turns freely by hand. The belt is fine, installed and looks very good. Door switch is fine. There is no transmission, only the motor. I would like to rule out motor, the motor control board or other component before sourcing an expensive replacement part.

Now, and here is a strange thing that may help you help me. When I start a Normal wash cycle (for example), if I rotate the drum pulley back and forth with a stick, the drum will start to turn and agitate on its own and then the cycle will continue until it is complete; the display counting down as usual. When the cycle is complete, the display goes blank as usual. When I open the door, the display shows information you would see for a Normal cycle (Normal is lit, 45 is listed in the display, etc. The display should remain blank after a cycle.

Any suggestions as to what my problem could be with the washer?

Thanks!