Hi
It is a Murrey panel which has a main breaker that I replaced. It is fairly new and it has 2 neutral blocks on each side connected by a flat pan cake type buss that connects to each neutral block. The service is wired with copper Se cable which looks just fine. The bonding screw is installed and connected to the neutral buss and the ground wires are also connected. The dimming will occur when any significant load is applied any where in the house. Very strange, still scratching my head.
Mike
