I used to replace the LNB SL3S4NR5-01 that looks a bit different. Worked great. I suddenly lost a couple of my DirecTV channels and got error code 771. All my coax connections looked good, there were no obstructions or bad weather. The next likely culprit was the LNB. It looks like many LNB SWMs are interchangeable, so I ordered this one. It installed without tools and solved my reception problem immediately.
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