John,
This is what you should be looking at:
http://www.pbresource.com/rebuildkit.html#KT-BFLIP03Plus as the others have suggested new coils and sleeves.
Weird as I'm a huge fan of these kits.....but.....have replaced the entire flipper assemblies with all new and they haven't worked as well as fully rebuilt original assemblies with new coil sleeves and cleaning.
Go figure