I have the same symtom. 7.6v at Dock charging pins. Did any of you verify if that is what the voltage should be? I would replace the dock if I knew for sure this is the issue but I cannot find the answer.
I am sending mine in for repair. I do not know how long this will take or when I will be able to respond, but when I do I can inform you as to what parts were bad and what the pin voltages are (after the repair).