Greetings folks After displaying the infamous red triangle my 05 Prius would not shift out of Neutral. After clearing the triangle by unplugging the 12v I reluctantly drove to the dealership. (I spent 3k at this dealer for a stolen cat) After a 300$ diagnostic on the battery they determined the following: -The HV battery cells hold a charge and are functioning correctly -Some metal components are “corroded by moisture” and interfere with the charge -Yota dealer does not clean HV packs and recommends a new 4K battery. My service provider was a kind and frank person. Towards the end of the conversation he mentioned that -it would be a waste of money -if it were his car he would clean it himself -I could use YouTube to learn (or forums like this -I could get a shop to do it “for time” My question is: Can I do this myself? If so how? And, how dangerous is this for a guy that has no experience with cars?