When it's yours you go the extra mile I guess...Mark, I give you credit for following through and patience. I don't know what line of work you're in, but IMHO you're doing what a lot of "techs" can't or won't follow through with.
Did all that... problem didn't go away until the front sockets were replaced with OEM pieces.Could not identify which bulb it was. Ended up removing all bulbs putting great on all contacts even the boards and problem went away.