So after installing a ColorDMD on my WPC Indiana Jones I noticed the right flipper was frequently weaker. After some research on pinside I focused on the flipper opto board. After replacing it with new spare, -- full strength again. I've also noticed the game sometimes now has some confusion with the Idol counting balls, again I believe optos are involved.
Not satisfied with the new loss of reliability I looked into the 12V unregulated path.

TP1 no load = 15.5V
TP1 w/colordmd and playfield = 11.3V (no motors running, not good for a opto/motor heavy game like IJ right?)

This is a big drop IMO. Reseated a;; 12V connectors, no improvement, I have no mods beyond Pinsound and colorDMD.

**Question I have is 15.5V solid to begin with?
**Should I expect a better, stronger 12V path if I rebuild the Cap and bridge?
**Will newer optos draw less?

Other notes: motors were rebuilt and cleaned out about a year ago, all optos are original except trough opto broads are new (and now a flipper)

I'll take some more readings with different 12V loads attached and post.
I don't mind rebuilding the 12V-u supply I've done a few of them, but want to rule out all other anomalies first and was hoping to hear some things to try to further isolate the drop since 15.5V seems fairly healthy as a start.....love the ColorDMD BTW, no way I'm going back so cleaning up the power is my goal now.

I've made new readings (TP1/gnd braid) while disconnecting individual 12v unreg loads:

System ON under idle load, no motors running: 11.52v (little better)
Full load with motors "homing": 9.9v - 11.1v (variable)
Disconnecting J116 (coin door): 11.62v (0.1v gain)
Disconnecting J117 (display, including colordmd): 12.59v (1.07v gain)
Disconnecting ColorDMD only: 12.65v (1.13v gain) (ColorDMD = 0.06v basically negligible)
Disconnecting J118 (playfield boards): 13.26v (1.64v gain)
Disconnecting J116, J117, J118 (include cdmd): 15.72v (no load reading)

Individual readings do not sum up to the 4.2v total drop seen between full load/no load, not sure why that would be.
J118 playfield boards draw the most, followed by J117 (display w/cDMD)

Guess I'll trace the under playfield +12v-unreg next and verify connections are solid. After that I'll have to start pulling boards or swap with another game to confirm the 4+ voltage drop.

Last update, I hope.
I replaced the Cap and Bridge today, they were original, under full load TP1 now reads 13.4v as compared to 11.3V prior to replacing.
Played a few games and loaded the idol a few times. The game kept track of all balls as it should and no other issues that I noticed.
thanks Dmod!