200 amp Cutler-Hammer main service panel.
The neutral bus bar was bonded to the upper grounding bus bar which was bonded to the box by a strap… but not connected to the lower grounding bus bar (except by the metal box).
The lower grounding bus bar had a grounding electrode that disappeared down the service entrance, hopefully to a driven rod or equal somewhere.
Shouldn’t the lower grounding bus bar which was connected to the grounding electrode have been connected to the upper grounding bus bar by something more than the metal box? Like a #4 copper wire?