Hint: Rusty connections
When these equipment grounding conductors were originally installed, I’m guessing there was no buildup of rust and corrosion on the terminal bar. Now, there is serious concerns with the electrical connections here due to a long-term water leak problem. We could point to a few Code Sections that may address problems like this including Sec. 110.12(B) which states in part, “There shall be no damaged parts that may adversely affect safe operation or mechanical strength of the equipment such as parts that are broken; bent; cut; or deteriorated by corrosion, chemical action, or overheating.” We could also look at Sec. 110.14(A) which requires conductors to be connected to terminals to ensure a mechanically secure electrical connection. The buildup of rust and corrosion here certainly makes these electrical connections questionable. The first order of business is to stop the water leak! Once the leak is stopped, repairs can be made to this panelboard by replacing any water damaged parts including this equipment ground bar and starting fresh with newly terminated conductors.