its your coach. do what you think should be done.
the jack fluid doesnt get hot, it doesnt wear out, and doesnt normally get contaminated. the pump has a 30 micron filter sock on it. so any material contamination is kept in the tank. this is for hwh, and power gear.
if you feel it need to be done, do it. it will make you feel better knowing it has clean fluid in the system.
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