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Don't know about manifold/s on something that old, but have two on mine and if valve on black return lines doesn't open...nothing can move. I would pull wires off and on that to make it isn't corrosion issue. You should be able to maually open valve to allow slides to work. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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