Still noisy outside the apartment :/ But, I just thought of something...
The manual points out that you should scrape away paint around the screw holes of certain areas. I scraped away the paint from just about everything on the chassis. But, I did not do that for the end bell.
I figured the end bell was just a protective / decorative piece and didn't need to really be grounded at all.
Do you think this could be a problem?
Thanks again.