Originally Posted by oppy
If it was me, I'd just drop the pan, check the filter and replace if needed, and refill.
To check the filter you need to cut it open. So checking is out, just replace it.
Changing the fluid in the pan and not changing the fluid in the converter is a waste of time and money. You will change less than half of the total this way. The article I posted above will change about 90%-95% of the fluid. It also has an option to change the filter. The author said that he changes the filter every other change.