[wiswind]

There is much discussion in this forum on tranny fluid changing.
You should be able to just change the fluid....without dropping the pan.
You can have it done for you, or do it yourself.
Easy...but MESSY.
I would do a COMPLETE change of the fluid....which involves removing the fluid return line ( the hose that comes back from the cooler(s))

Again, this is routine maintenance that you want to do......or you will likely be looking at a very expensive transmission repair / replacement.