Hi Chilly.
Don't have that pin, but would suspect dirty/mis adjusted switches, at least.
Those get gunk in them, and get bent outa shape a lot...
clean the contacts with a dremel tool with a brass brush, adjust and try it.
for the scoring, look at the bonus parts, one is not switching between the 1 and 5.

the ones behind the kickers.
and the bonus...well... could be anywhere.
there should be labels on the relays to identify them.
chk under the play field first.

Disassemble the unit and clean or replace the coil sleeves. Polish the coil plunger rod. Make sure the rubber is the right size (not too tight). Make sure linkage components are not rusted or binding, clean and wax/polish. Adjust switch where it is sensitive but not too.
If all else fails replace coils with a hotter version.

What he said!