This is on Mystic. Sometimes the computer controlled lights are fine. Sometimes they are dim. Where do I start troubleshooting?

Incandescents throughout, except four LEDs in my custom topper that are jumpered off two computer controlled incandescent lamps in the back box.

They are all dim at the same time.

Paying closer attention, it was mostly the top two rollover lanes lamps. Turns out, these two are the very end of the line, groundwire-wise. Flowed a little solder. Helped a lot, although there is definitely an ify ground connection somewhere.