Switch 43 stuck closed ?

LTG : )

It's a system 11 game so the knocker on switch failure (also known as a credit dot) is set via adjustment #50 Switch Alarm Knocker, if you don't want it to knock when a switch fails, turn OFF adjustment 50. Else it will knock like that (to get to ops attention) when a switch is broke.
The knocker noise is normal and NOT a malfunction when it is set to yes.

Switch #43 is the right ramp diverter switch. It's the right switch at the top back of the black ramp just to the left of the right habit trail. This switch is broken on your machine (see wiring, diodes, wireform, etc.)

A switch error happens when a switch hasn't worked in 30 or more games.

Fix the switch and make the error go away. Even with Adjustment 50 off, it will still pause and make a siren noise from the speakers at boot for the broken switch until repaired.

I get that when non-pin people come and play, they don't hit all the switches, then after 30 games or so without hitting that switch you get that warning on startup. Whenever that happens I just ask my girlfriend to play, she's damn good at clearing the errors and credit dots.

If "Constantly" means "7 times whenever I turn the game on or go in to test/audit mode" then yes, that's the Operator Alert feature, and means switch 43 (right ramp) is either stuck closed or open. You needn't disconnect the knocker, just set ADJ 50 SW. ALARM KNOCKER to NO.