Hugh zephyro Posted January 8, 2021 Share Posted January 8, 2021 (edited) http://imgur.com/gallery/dYQcVII I have RMA a SF600 and got a refurbished unit. It has been working fine for a few months but recently iv noticed a wierd sound coming from it. This noise is quiet and happens occasionally. Should I be concerned? Edited January 8, 2021 by Hugh zephyro Link to comment Share on other sites More sharing options...
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