Problem resolved!
I did find a mobile mechanic to install the new coax cable bundle that I had purchased from Winegard (at their recommendation). After switching the cables, we ran the Wally diagnostic routines to verify signal strength, and then both TVs started working fine!
If you are in the Tampa area, and you need help on RV or motorhome repairs, I recommend calling Zach Wiles, from Elite Mobile RV Service in Clearwater, FL at 727-238-0990.(or email him at EliteMobileRVServiceLLC@Gmail.com).
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