For our trailer, which uses the Ground Control 3.0 system, the control board is in the little cubby which also contains the water pump. Might be the same on your trailer.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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