The black arrow in your photo points to an alligator clip tied I think to a bare wire, which is connected to a black wire on the relay coil. That's not right.
Look again at the schematic in reply #5. In the upper right corner, the spring looking thing highlighted in red and labeled "Player Reset relay" is the Player Reset relay coil, or the cylindrical part of the relay with two solder lugs and the green wrapper. It's connected to an 80/black wire and a 71/orange-red wire. Neither of those are part of the circuit we're interested in on the left side of the schematic.
What we're trying to establish is whether the make/break switch on the left side, highlighted in red, leading to the Player Up Unit Reset and Step Up solenoids is working properly. A make/break switch has three switch leaves or solder lugs. The middle switch leaf is longer than the other two, and is activated by the relay armature or rack. As the relay activates and relaxes the long switch leaf moves between the two, shorter, outer leaves. The middle leaf makes contact with one outer leaf or the other, but never both.
When the Player Reset relay is relaxed, as drawn in the schematic, the middle leaf (connected to the 75/orange-white) wire connects to the short outer leaf tied to the 48/green-black wire leading to the Player Up Unit Step Up solenoid. When the relay activates the middle switch leaf disconnects from the 48/green-black wire and connects instead to the other outer switch leaf which is connected to a 90/grey wire that leads to the Player Up Unit Reset solenoid.
The connection through the middle leaf of the make/break switch (75/orange-white wire) to the outer leaf (90/grey wire) when the Player Reset relay is active may not be working. So jumpering those two wires together will bypass that switch and connect the 75/orange-white wire to the 90/grey wire all the time. If that lets your Player Up Unit Reset solenoid fire that would indicate that the switch isn't working correctly.
So to do the experiment you need one end of the jumper clipped to the 75/orange-white wire on the middle switch leaf of the make/break switch and the other end clipped to the 90/grey wire on one of the outer switch leaves (or clipped to the 90/grey wire on the Player Up Unit Reset solenoid at the other end of the grey wire).