Touchscreen is not working, what part do I need to repair according to error codes

I have Whirlpool WFW5620HW0 and doesn’t respond to power button or hardly any buttons. When I go into diagnostic mode pressing any three consecutive buttons within 8 seconds, I see error code E2 and F6. The E2 code has always been there and the washer has worked, I believe it has to do with detergent dispenser. The serious issue is the F6, I need help in either fixing the issue or identifying the right part to replace. I’m not sure if it’s a wiring issue or bad contact somewhere. I took the front panel out and inspected the back for oxidation, I lightly brushed the visible contacts and cleaned with rubbing alcohol and q-tips. Other than this I have done anything else. Please advice