On Black Knight, the upper playfield right drop bank solenoid isn't working. I tested the solenoids in solenoid test mode and its #5 on the test because when it reaches #5 nothing fires. I tested the solenoid and it fires when I ground out the metal transistor. I replaced the diode on the solenoid even though it was fine. I tested the transistor and pre driver transistor as well as the 7408 chip. Everything tests good. What can I check next? I don't think its the PIA chip because if that chip was bad it would cause other issues other than this?