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My unit is a 2014 Alpine but I had the exact same issue you had..
.. LR OTA TV pic was fine
.. BR OTA TV pic was fine
.. BR park cable TV channels fine
.. LR park cable TV channels would either not find as many as BR TV would and / or the LR TV set pic when on park cable was grainy
After much troubleshooting my issue was a splitter that provides cable TV signal to both LR and basement TV wall outlets
My problem would also be intermittent .. sometimes LR TV pic when using park’s cable was great and then sometimes it would either not find the channels or they would fade out
Diagram of my 2014 .. note the splitter marked with red arrow .. on my unit it is located behind the stairs climbing up into the BR.. I also had access to it from the basement with the rear access panel removed
I replaced the OEM splitter with a new one rated at higher frequency range ..
No further issues
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