Quoted from Bubbatom:
If one of the wires turns out to be broken, this would be a fairly easy fix? I assume connecting a wire from the solenoid into the connector would be fairly easy?
It can be, depending on your ability.
Remove the whole assembly rather than try to work under the lifted playfield. If I recall there's two wiring harnesses to disconnect. I think there may be a tie-wrap or two to clip off.
Buzz out all the wires with an ohm meter to check for continuity ... and move the harness to see of you lose continuity at any point.
Assuming you narrow it down the wiring harness (encased in shrink tube) you'll want to remove the shrink tube (carefully with a small pair of scissors). That will expose all of the inner wires. Inspect each naturally and look for a break. Be aware though that the break may not show through the insulation. I've had breaks inside (the insulation is more flexible than the copper core). Again, you can try to narrow it down with an ohm meter.
And now the decision: repair the one broken/failing wire, buy a new wiring harness, or make your own. Again, this all depends on your skill level, and whether you have all the parts, and patience. A quick repair will be exactly that ... and get you back working again, well - quickly.
Not sure if someone sells a pre-made harness. Won't be cheap, but with a few solders and a couple of tie-wraps you're back online, and likely reliable for the remaining life of your BR in home-use.
To make your own will be much cheaper, and you'll only have to do this once. You'll need shrink tubing, tie-wraps, molex pins and a pin crimper, a molex pin extractor (if you want to keep the harness housings), stranded copper wire (not sure of the gauge), and time. But ... aside from it being time consuming, it is kinda easy ... and you gain new pinball repair skills. I did say this was a cheap option, though the crimper (if you don't already have one) can be a bit pricey ... but it's a one-time purchase and you'll likely use it for many other repairs down the road.
Good luck. Again, if you need any pics let me know ... my BR cannon is still on my workbench waiting an overhaul. I will likely build a new harness.