I figured i would jump on this thread as i am having a nagging bonus issue as well..... the left side works at it should....step up twice or 3 times depending on the setting chosen for top hole but the right side will only step up once regardless of setting. Now it looks like it gets stepped up by 3 c but this controls both L & R step up at same time decided by switch on change relay. Any help would be great.

Actually i got it working....here i thought the issue was on the bottom side but ended up being a closed switch on the right side bonus switch under right plastic. I had gone through the top side switches and adjusted when it first showed up but had forgotten one of the other guys changed to colour rubbers and i didnt even think to regap switches after that.
That even fixed a issue with right spinner not counting the same bonus as the left spinner with same amount of spins and here i was cursing those spinner relays and couldnt find any issues. Oh well every relay and units have all been gone through and cleaned/gapped now so should be good for many years.
Gotta love working on EM's

To answer that question it was just pulsing the right once quickly