Yes a transmission fluid change is a good idea, its a bit of a game to do it though, search for the Gibbons method and be prepared for some spillage.
These gearboxes have an oil cooler built in to the main radiator which can split internally leading to coolant escaping into the gearbox. The glycerol attacks the friction linings in the 3 clutches and leads to premature failure. So if you start using coolant act promptly to avoid costly repairs.
It is possible to retro fit an air cooled cooler to avoid this.
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