Sorry to sound stupid here, but I'm not sure what you mean by "inspect the buzzy bus header" or what to look for. There are a set of screws that both flying bus cables were manually wired to. Beyond that I'm not exactly sure what I'm looking for? This is the PSU:

http://download.siliconexpert.com/pdfs/2017/7/21/11/32/19/509/mwe_/manual/209402834386489rt-125-spec.pdf