Making progress! Have the 10 point chime now working (as stated earlier) and yes the pop bumper relays are on the underside of the playfield. So cleaned/adjusted (slightly) and now I have both red pop's working as they should (scoring either 10 or 100 when the light is lit) So much better when all 3 chimes are working and the slings and the pops work.
I did notice (before I gave up on it last night late) and it's probably more on my "adjustments" - but when I hit an un-lit pop (or even a sling) it's scoring 100 points not 10. Then, after the pop's are lit - those lit will score 100, while those unlit & the slings then score 10 points as they should.
So somehow I got something backwards or out of whack! lol
And I agree - my MH (SS) and Bobby Orr (SS) have sweeter sounds than the Nip-it or Hang Glider (both EM's) - especially when first starting a game