Washer errors out at different parts of the cycle

I have a Kenmore Elite HE4T washer, model 110-45081-401. The washer stops at random spots in the cycle and gives different error codes, sometimes SUD, sometimes F02. If you hit the Pause/Cancel button, open and close the door, and hit Start, you can get it to start up again. We removed a sock from the lint trap behind the bottom front access panel, checked that all the other hoses before and after the lint trap are clear, checked the water-level pressure switch under the top panel (back right corner as you look at the front of the washer), checked the belt, removed, cleaned and replaced the detergent drawer, and checked the water inlet hoses. There is a distinct hot electrical smell right before the washer stops and throws the code. Everything inside the cabinet looks very clean, almost like new. No corrosion, not even dust, it looks great. Any suggestions? Please don’t tell me to call a tech. That’s not what this forum is for. If I could afford to call a tech I wouldn’t be posting here. (Now some smart-aleck is going to try to distinguish himself by telling me to call a tech.) Legit advice is welcome and appreciated. Thanks very much.