Have you filed and adjusted the EOS switch for that flipper? If the Eos switch is new, you may need to file it to get some residue off the contacts. Are you sure it's wired correctly?

Nice! Glad it was an easy fix. That adjustment is likely a Jones plug somewhere, possibly in the backbox. It's often a matter of pulling a plug (it may even be a single pin) and plugging it into a different receptacle to toggle between 3-5 ball play.

If the plug is not in the back box, look on the main board near the end where the coin box sits.

According to the manual, the 3 - 5 ball adjustment is on the Bottom Panel.

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Can you increment and reset the ball count unit? I'm not familiar with your particular game, but i know on ones I've worked on, there's usually a coil that steps the unit forward one increment at a time and another coil that resets the unit (it springs back to a reset/home position). It might be gummed up or something, causing it not to rotate back to it's reset/home position.

Can you post some pics of the unit in question?

Ahhh, i gotcha. Do you have the schematic for the game? If so, could you post some pics of it?

I gotta admit, I'm not sure how much further I'll be able to help with this problem but hopefully one of the resident EM gurus can pick up from here and get you to the finish line. We're getting into more-or-less uncharted territory for me. Still, many problems with EMs ultimately boil down to a broken, dirty, or mis-adjusted switch (or wire broken off a switch or coil)...so maybe we'll get lucky and figure it out anyway

Did you check these switches? You can turn the score motor manually to watch how they operate when the motor turns (with the game off for safety). Even a visual inspection might reveal a switch in need of adjustment. Sometimes those switches are buried on those score motors, so it may be tricky to get a good look at the switch(es) in question.

You're most welcome! Be careful checking those switches with a meter, sometimes they'll give false readings because they're wired in with other switches that may provide another path to the other side of the switch (not always though). Either way, it sounds like you're on the right track! You'll have this fixed before you know it.

Another tip: the whole score motor/relay board on the bottom of the cabinet can usually be removed for easier access. With the playfield propped back against the backbox (or removed entirely), you will need to unplug any Jones plugs that plug into it the board from the playfield & backbox, remove a couple big bolts that attach it to the bottom of the cab, then carefully lift the whole thing out to service it on a table or work bench. (Not sure if you already knew that, but it's very useful info in case you don't )