Thanks for the reply. I'm kicking myself for not having taken a video before sending it off.
The rotor is otherwise silent during normal operation, apart from the satisfying zippy sound it makes when rotating. No other unusual sounds like I've observed on an ETA 2824 that I didn't service as recommended. :P
The bracelet doesn't sit flat even when not wearing the watch. It does still feel solid and secure, but it's like someone had been very rough or careless when operating the clasp previously, maybe not understanding that it was secured by friction.