Adblue error

Last month my Audi gave the error "Activation for the non-plausible signal reducing agent pump" and "Pump for Short circuit to ground reduction agent". In this case I had to replace the Electronic Unit, it was NOT the faulty pump, but something like moisture in the electronic unit

I add photos to see the status of the electronic unit, photos.app.goo.gl/PM5SPoPv9WGqme1s7