May I revisit this thread with another query about the PTU.
If I am not mistaken, the distinct sound of the PTU can be heard when the landing gear is retracting and extending. There are also a lot of videos on YouTube taken in the cabin and the PTU can be heard when the gear is in the process of being retracted or extended.
Is the PTU working during landing gear operation? I don’t remember ever seeing “HYD PTU” on the ECAM Memo for this, but that’s not where I am usually looking during those times anyway.