99% it's the upper check valve.. I finally replaced it after the hot water stopped.. It hummed for almost a year before I heard a pop and the hot water went to a trickle..Took abobut 20 min to change out.
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2008 MS 4212 2007 Freightliner M2 MountainMaster..2012 Victory Cross Country behind the cab. 2011 Honda Fit pushing the FL and the MS
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