It's likely a broken hold winding, or a bad or broken diode that connects to it. Take a look at the copper winding on the flipper coil, the thinnest one is the hold winding.
Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside