Got a system 3 gottlieb and half the cpu controlled lights in return 4 come on one at a time until game is warm...like 3 - 5 mins then they work fine. Half of the lights work in that return though even when game is first turned on .... Anyone ever have this? Thought I would see if anyone had something like this before I dug deeper.

Turned out to be a bad [slowly dying] transistor at q-49 Put a IRL540n in its place and reflowed all the resistors for good measure and what a difference.
Out lights are fixed and others are brighter.
Just posting to help others should they find this.