@chrisinroch - check out my August 2019 post PDF in this thread. List of changes per model year 320s and 400s. https://tab-rv.vanillacommunity.com/discussion/comment/124689#Comment_124689 (View Post)
Here is a picture of the Alde from a recent post (thank you @MuttonChops). The bleeder assembly is noted - the heavy brass assembly marked A. (View Post)