By center kicker hole, do you mean the top center saucer hole? And does it activate the "right" pop bumper, not the left pop bumper?

There's four momentary solenoid select signals from the MPU board to the Solenoid Driver Board (SDB). These are signals PB0, PB1, PB2 and PB3 which come from pins 4, 3, 2, 1 respectively on J4 of the MPU board and go to pins 6, 5, 4, 3 respectively at J4 of the SDB.
From the Solenoid Driver Board (SDB) schematic, below are the four PB0, PB1, PB2 and PB3 signal states and which solenoids the combination of states select. The four digits in the left column are binary numbers - "0" means zero volts, "1" means 5 volts.

One of these four signals is not reaching the SDB circuit effectively. The designated solenoids listed on the left are what should activate, the solenoids on the right are what you're getting. Red ones are your wrong activations, blue are likely wrong that you didn't mention.
PB1 signal isn't getting from the MPU board to the SDB and the SDB is always seeing PB1 as a "1". This is a blue-red wire from MPU J4 Pin 3 to the SDB J4 Pin 5. So you need to find out where the break in connection is - probably one end of that wire has been badly crimped, a crimp terminal is bad or the header pin on SDB J4 pin 5 needs to be resoldered.

NitroGroundShaker_WrongSolenoids.gif