My gate looks like it used to have a spring on it, but it falls back down by itself so I haven't messed with it. After the first point is scored anywhere on the machine, the solenoid should deactivate, letting the gate down.
So, 1) is the solenoid turning off? 2) maybe its time to take the assembly apart and clean it. No lube on the plunger! New sleeves for the coil are cheap, but you have to pay shipping and wait for it to get to you. Might as well try just taking it apart and cleaning with alcohol.
I use qtips and wooden coffee stirrers (like very narrow popsicle sticks) wrapped in paper towel and alcohol to clean the inside of the sleeves. If that helps, next time you have an order for PBR get some sleeves.
I'm not the guy to advise on relays and switches... I'm very new to all of this, too. But the switches on my ball trowel are closed when the ball is on the switch and open when not.
If you don't have a leaf switch tool, get one. Very handy.
PBR has rollover buttons, but I haven't looked closely enough to see if they match Heat Wave.