Quoted from Santis:They look like the backbox flashers. If sockets are different color than the other is because those are flashers.
I'm pretty sure there are no flashers in the backbox of roadshow? If you order a LED backbox kit you get 35 'regular GI bulbs'
There are 35 identical sockets on the insert panel, there are 6 wires coming from these, all are connected at J120 (on mine, could also be seated on J121, they are interchangeable.)
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You can start with re-seating the connectors (if you haven't already). Try swapping the connectors at J120 and J121, they might already be swapped, the connector with 6 skinnier wires are backbox GI (the manual show J120 as GI to playfield and J121 as GI to insert panel)
Also take a look at J115.