Update- WD 40 didn’t really work for very long- maybe I didn’t apply it correctly?Thanks for this thread! The sound has been driving me nuts and SC couldn’t do anything after two visits. Problem is way better now with wd40.
Berkeley SC seems to have fixed the noise after the 3rd visit. I don’t know what they did as I haven’t seen invoice but it is very noticeably better after picking up today- hopefully it will stay that way.