I know this may be stating the obvious, but your coil on the ball return kicker assembly does not look in tip top shape! I'd suggest measuing the resistance through that coil - that is if you can; given it looks like one lug has broken off. Either way I would be replacing that coil.

Oh, one more thing. There's something disturbing in one of your photos...
313be387333b65e2c52e3ca04a8339764215d111_(resized).jpg
Please remove from your workshop before the whole of EM Tech have a collective conniption

Synchronized restoring - could make the Olympics!.

MaxAsh, your schematic probably lists the correct coil for Mecha.

PBR will stock, but you may want to wait until you have a list of things you need.

A tip I wrote elsewhere in case you have not used PBR:

While they are really the go to place for EM's their web-site is a little, well, dated - so I always use google to search it, then Ctrl+F once on the page,

for example, enter this in google:

coil site:pbresource.com

that will display link to this page http://www.pbresource.com/coils.html, click on the link, then click on the Bally link, then Ctrl+F to search for coil (hopefully description from MaxAsh) and you will jump straight to their part.

Also, they don't list everything, so often worth dropping them an email if not sure.