I put a couple videos spn sent in
https://bingo.cdyn.com/slots/pics/in the bonus_abort_2.mov video, you can see the super jackpot relay unpowering when the pay completes, and he panned around immediately to show the super jackpot unit ... which is stepped up all the way. Perfect video!
the problem is the super jackpot unit did not reset, so the game thinks you've had all your bonus spins.
when you spin the reels and get three clowns, the regular jackpot relay should power and stay powered while the three clowns are on the reels. Check that.
the reel mech B-3 switch should close (yellow and orange/black wires) - check that switch.
if the open-at-zero switch on the super jackpot unit is working right, the super jackpot unit will reset when B-3 closes. The open at zero switch is in the video around 15 seconds. It's the switch with the orange/green and blue/orange wires. The orange/green goes to the reset coil on the unit.
B-3 has different timing than the usual reel mech B switches. Can you post/email a pic of the entire left side of your reel mech ... a video of the entire windup/spin would be even better if you can spin your reels outside the machine.