[MT-2500]

Good grief.
There is no excuse for not changing the filter.
It is one of the main parts of a trans service.
They are just to lazy to drop the trans pan.
Do not let them feed you that bull on not changing the filter.
Tell them to stick there power flush with no filter change.
Find a repair that will change the filter for you.
The filter is the main thing on keeping your fluid clean.
You can do it yourself or take it to a good repair shop and have them do it.
Filters kits run from 15-25$ plus fluid.
If it has a reusable molded rubber gasket reuse it instead of the paper gasket that comes in some filter kit.
MT