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Buzz other than draining the oil out regularly I dont believe there is any maint necessary. Check for any leaks around the fittings, and drain oil. If it suddenly had no oil in it I would be concerned. If the check valve failed I would expect it leak around the fittings if it could not breathe. The hose are just pushed on, the pressure involved is fairly low I believe with venting crankcase gasses and vapors
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