The gearbox should be filled with fully synthetic ATF. Volvo do not make any recomendations as to refill mileage but I have always advocated doing a flush refill every 100,000 miles to be on the safe side. Do not use any stop leak types of fluid as they will damage the AW box. Basically check for signs of leakage and attempt to put a stop to it.
All the best, Peter.
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