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Regen Issue

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Have a regen issue with my Mack.

2011 Mack LEU613 - MP7

SPN 3491: Aftertreatment DPF Atomization Air Actuator FMI 12 / Faulty Device or Component.

Mid128 - Engine ECU

Psid59 - Aftertreatment atomization air solenoid

FMI 12 - Faulty Device or Component

I have a few units in the shop. Does anyone have a diagram of the components?

I fixed one before with just swapping out the solenoid. Can just the solenoid be purchased?

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