Metal particles in A999 transmission

Jax said
Can I lower the valve body while in the vehicle without any small pieces of parts falling of?

Yeah. Only thing besides the bolts holding it to the case is the park gear rod. The rod is an interference fit with the parking pawl and pulls out with the v.b. It's held on to the v.b. with an e clip. You may have to rotate the output shaft to get it out if it's stuck.

The park rod can be a bit tricky to re-install. Again, you may have to rotate the tail shaft until it's in the right spot. Before re-installing it, unclip it from the valve body and install it by itself so you can feel it click in to the right spot on the park pawl. Take it out again then re-attach it to the v.b and install the same way with the v.b. on. Sometimes you have to twist the v.b. a bit to get it to seat in the right spot but don't force it.

You really can't do much without taking the valve body out.

Jax said
Just as additional information, the transmission has approximately 350 quater mile passes...

That's a decent amount of runs, probably time for a re-fresh anyway. Don't want to spend your money but might consider at least replacing the wear parts like the seals, clutches and frictions in addition to whatever is broken.

What did the fluid look like - clear red or dark brown/burned smell?