I dropped the pan and changed the fluid and filter. What a PITA to change the filter gasket! I also did a flush of most of the fluid via the trans cooler line. A bit messier then I had expected... But it did work pretty well overall. I used a case(12 quarts) of the Mobil Dex VI fluid.
The old fluid looked pretty decent but we have no idea if/when it was ever/last changed. The car did have a lot of work done at what looks the dealer before it was parked. There was almost nothing in the pan, the magnet did have a small amount of very fine gunk on it.