On the schematic for our 37LX , it shows the satellite prep coming out near the antenna about 1/2 way between the kitchen plumbing vent and the 1/2 bath vent. I stuck my head up there and took a peek and it looks like I have what appears to be another plumbing vent in the location where the satellite prewire is on the schematic. I never went up there to check it out though. Do you have a plumbing schematic and if so, check to see if you have an extra vent not shown in the plumbing schematic. Hope this helps.
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