Most places that do the trans flush do not replace the filter. The influx of revitalized detergents will disolve and dislodge lots of gunk that can further clog up the filter if it isn't changed. If you do it yourself, remember by removing the trans pan you will not get all the fluid out. The torque convertor holds several quarts as well. If you are not going to change it regularly, I would change the fluid & the filter twice fairly close together.
I change mine every 2 years & never drain the torque convertor.
Don
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