I think that's solenoid 4 "Lockup Popper"?? If so it's from connector J130, and that string covers your outhole and ball serve for example, so if they're working, it's not likely a wiring issue. if I'm right as to the solenoid number, Bigfoot's on a different connector (two actually). Sounds more like an issue with the coil, electrical or mechanical. Might be worth swapping the diode, and also checking for any mechanical binding issues, or replacing the coil and/or the plunger which can sometimes get magnetised and become faulty.