[cglrcng]

Begin by removing all the black tubes 1-by-1 from the block and check for flush tube end cuts (square), tube ends, trim as necessary properly, and re-insert them, push all the way into the connector & pull or tug out to make sure they are fully seated properly...I can see the bottom second one in pic#3 is not all the way in, see how the connector is higher than all the rest nearby. *That should not stop the lights from working on the individual sol's, but minimum air pressure is needed to actually make them fire. No doubt in my mind that port is leaking much air.

Will the system currently hold stored air for say 15 or 30 minutes or more if you pump it up to 60~100PSI without leaking down much? If not, get that right first. Start at the compressor and find the leaks first, 1 connection at a time. Once it does, try overnight. Pump it up, turn off robot power, watch gauges for pressure bleed down.

I'm sure you already found that speed controller in the pics w/ only the ground attached and the positive not attached any longer upper left in pic #1.....Looks like it (the hot), is in your fingers. And need a bit more insulation tape on the PDB connectors main power connections (IMPORTANT not to see any of the silver connectors there). Also suggest blowing that bot out w/ some compressed air to clean out the debris a lil'.

Addition: I just looked at Pic#1 and the second black tube in the top row also isn't seated all the way in either.