lights flickering very slightly only when cold

[epapp]

If you watch the HVAC LCD and interior lights when the car is cold, you can see them flicker ever so slightly. The headlights do not flicker and I have maybe only heard the radio cut out once for about 1 millisecond. I've decided to check the current distribution box, but

1) Where the heck it is at? I have the group 9 circuit diagram and I can only gather enough from the pictures to assume the current dist. is in the trunk near the ecu.

2) Since my charging system check out fine (volt meter at terminals when car running), I am thinking a few other things: grounds (battery grounds are fine). Any specific ground that you can recommend I check first?

Thanks