My Scout is a first-run bike #69. As such, the coolant is now roughly 5 years old and, according to the service info, is due for a coolant change. The bike has only has 3,500 miles to date. Question is; How involved is a coolant change? I like to do as much of my own work as possible, but was wondering if the system needs to be pressurized or "charged" by a dealer in order to function properly. Thank you in advance for any responses.