Common dash cluster issues question

Nice post, thanks. Mind you, not what I was hoping to hear, but sounds like if the socket doesn't fix the issue, I'll be pulling the dash back out. One of the dash mounting screw holes is (now?) broken, so I'm glad that the dash cluster itself isn't grounded to the frame of the car by way of the mounting screws.
?? I don't understand. Originally the cluster IS grounded (factory) by the mounting screws. The grounding pigtail I mentioned is a YOU install it deal