kenmore he 2t error f-22, f-28 and f33

Kenmore model 110.47571600

Hey. It looks like I'm replacing my washer but I wanted to check in with y'all that might be more experienced with this issue.

I cleaned the drain filter and checked the pump impeller. Tested the door lock and it appears to be working but intermittently. And I opened up the main board and there are 2 discoloured solder points on it.

I have the washer ripped apart right now and all the connectors on the main board seem fine.

Does anyone have suggestions on things that would cause f-22, f28 and f33 errors?