Where are you in MN? Am in Prior Lake myself. Let's help each other out here as I have a sample DH as well with the drop target.
My machine is runing LA-2 ROM and P-1 sound. I have no idea what changes have been made over the years, but will try to do some checking. I have not experiened any issues that I am aware of.
As McCune mentioned, the light that illuminates the jackpot insert in front of the right ramp is a 555 that stick out from the PCB light board.
Have not found any plastics, but could use a few that are cracked and could also use a new standup target as one is partially missing. Will search for both of us.
Now for my question. On the underside of the playfield, in the set of wires that runs across the back of the playfield (furthest towards the back of the cabinet), I have an orange wire with a solid light blue (or grey) stripe on it that is cut and has black tape over it with nothing else attached to it. I also have two red wires with a light blue (or grey) stripe on it that are cut and soldered together to form a loop. I have not noticed any issues with my game, but have no idea why these wires are like this and have not monkeyed with them since everything has worked on this game for the last three years since I bought it. Does your machine have any goofy wiring like this?
Dave