Every 50K miles. The dark red fluid should be bright pink, hard to tell the actual color on the dipstick. There are two methods to flush the tranny: drain the sump and refil several times or flush the system yourself. Do NOT use a machine to flush the tranny! The extra power of the pumping maching destroys the interal pump and lodges dirt in all the wrong places.
Do a search on flushing the tranny, it is quite easy and less than an hour of your time. If you drain the sump, make sure you have some extra aluminum crush washers - the same size as for the oil drain plug.
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My back feels better when I sit in a Volvo seat
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