Quoted from bowtech:
I'm the club but need some repair help. The out lanes and in lane switches do not register a good friend and knowledgeable pinhead thought it might be the diode on the left inlane switch so I replaced it but made no changes. Any help would be greatly appreciated.
Forgot to note both slings work.
I just did this on mine with the help of another more experienced pinhead.
Refer to switch matrix and note that sling switches are not the playfield upright switches, but the end of stroke switches for the sling plunger (wire colors). Slings will still fire even if switch column is out, but will not register points.
I'd bet your whole column 8 is out, including left flipper eos.
Long story short i replaced transistor q46 after confirming it failed continuity test and that did the trick. Confused the hell out of me for awhile