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There is a black, U shaped thingy about 3" wide and 4" tall mounted on the left side of the firewall of my Class A. It faces front, has a light bulb, a switch to turn the light bulb on and off, and about a 2" wheel labeled "retract" with a peg to turn it. When I turn the wheel it feels like it might turn a damper valve and it is on the opposite side of the firewall from the HVAC distribution box. I have had my motorhome over 2 years and just now noticed it.
What could it be?
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97 Aerbus XL3250, 06 Honda CH80
DIY Banks, track bar, acoustic insulation
Koni FSD front/Bilstein rear
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