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The UL error code is indicating that the machine is sensing and (U)nba(L)anced load.
May I ask why the other parts were replaced? Was it for this same error?
If the UL error is coming on without any clothes being in the washer, the most likely problem is the damper rods that the tub hangs on, are the old style . There has been kit to replace the old ones. I couldnt tell you why it would happen just after replace the CPU. Thats why I asked about it.
Here is a video of replacing the rods. You will need part number W10189077
It is a pretty simple job and if you are handy, it should be a breeze.
click for part
click for video