1. The Scorpion speaker has an easy field-replaceable basket. No need to replace the whole speaker. Look at the label on the side of the basket and buy a replacement for it. Peavey may have one or check with the bay or verb. 2. You should be able to get De-Oxit into every pot with little or no effort. Don't forget to clean all of the jacks and removable connections and connectors as well. 3. Yes, the grill cloth frame is held on with very strong (usually plastic) hook and loop type connectors. I find it easier to remove it by pushing in out at the top, above the speaker from the rear of the amp with a long, flat object. Be careful to to puncture the speaker. if you slip. 4. Yes, the reverb wire harness has two RCA-type connectors at the reverb pan and a 4 pin Molex connector at the chassis. Be sure to clean those connections as well.