53974 Balboa Circuit Board EL2001 MACH 3 - Replaces Mach 2, 53974-03, 53974-04, EL2001M3R2C Balboa Circuit Board EL2001 MACH 3, 53974, 53974-03, 53974-04, 59-138-1022 If you are using this board to replace a Mach 2.1 you will have to move the circuit board stand-off's inside the control box
59-138-1022
