According to the schematic (playfield switches) the orange wire goes to the slam switch, left sling, lower left 3 bank middle target and 'M' target on the 6 bank.  Reconnecting to the M target (see pic) should solve the problem.  If not, check that each target registers as it drops, as the CPU needs to see all targets down to reset the bank.  If any do not register, try cleaning and adjusting that switch.  If still no go, report back!

cheers
Ian