We found it very helpful to video the processes with the RV Tech. We asked a lot of questions and his explanations provided additional info for when we winterize it ourselves. It is easy to review every year before we need to winterize. We divided ours into specific areas, i.e. water heater/bypass, inside lines and fridge/ice maker, washer, utility bay and city inlet valve.
Hope your RV comes out of the hospital healthy and ready for a good time!
2015 Providence 42M, Toad - 2002 PT Cruiser with Air Force 1 brake system. Cummins 450 ISL 9L), Allison 6-spd transmission, Freightliner chassis