So I bought the full shop manual and everything looks super simple to change diff fluid but the manual says to run the diff cooler pump with a scan tool for 2 minutes so you can properly check the fluid level ( I would imagine you might want to also to fully empty the system ?) How are you guys doing it ? With a scan tool or other means ? If scan tool which one are ya using ? I don't need the full boat scan tool capabilities just want to simply switch the diff pump on/ off so looking for inexpensive ( read cheap!) Thanks for any input ! Cheers !