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Assuming they used the Williams WM-775b air modulator? This is the same as my 84 Wanderlodge. I believe they are to be replaced every 25k miles or something like that. I will try to find the documentation on it. I have been thinking about a replacement for these modulators when they finally become extinct. The replacement I think would be best is a cable operated modulator that could be connected to the cable that goes the engine governor. Wanderlodge used these on their Cat front mounted engines.