Features:

• Through mounting of all key components for field repair: 74HC175, ULN2803A, and drive transistors
• LED indicators on all of the solenoid drivers to indicate when the driver is active (firing)
• Additional feature for the LED’s, if locked on then problem in MPU
• Test button for all of the solenoid drivers.  Press button and solenoid fires
• Solenoid transistors rated for 33A so the fuse should go before these do.  Very common in both SMT and through hole
• Screw ground terminal for that nasty ground connection that Gottlieb missed connecting everything.