Few thoughts.
Agree that wiring breaking to one typically wouldn't break to both at the same time.
Troubleshooting this yourself really wouldn't be too hard. As someone else said, when they had a channel go bad, they swapped the "B" and "C" speaker outputs. That's one easy way to check.
If you still suspect you have a wiring problem... If you get behind the stereo and disconnect the speakers, you can also then pretty easily test the cabling. Disconnect from the stereo, and the speakers both. Twist the two wires together at the speaker end, and then go test continuity at the stereo end. Eliminates the wiring unless the problem is in the connection to the stereo or speaker right at the connector.
Additionally if you don't want to mess with it or don't feel up to the basic electronics troubleshooting and don't feel like waiting until August, any car stereo shop can do this for a reasonable fee. They will probably offer upgrades to the speakers or the head unit also, if you want to go all-out and have a nice system. The good shops can also offer things like running the wiring and installing backup cameras and all sorts of goodies, for a price, of course.
Of course you'll need to find a shop with enough parking for your trailer and all that, but our local automotive stereo shop has said even if we had to park it next door in the back lot of a car dealership, they've worked with those guys before and they'd set it up with them and bring the toolbox and parts over to the trailer.
Not "cheap" or "free", but personally I wouldn't bother trying to get warranty work on the junk stereo that is provided in these trailers. If ours fails in any way, my first call will be to my favorite automotive electronics installer at our local auto stereo place and he'd have that stuff ripped out in about an hour, and easily have a custom panel and stereo and DVD or whatever we wanted to pay for and new speakers that sound good installed all around in an afternoon, easy.
He did an install of a dual DIN stereo/GPS/DVD/Bluetooth combo unit into the tow vehicle that doesn't have quite a dual DIN sized mounting hole and made the cuts and modifications to the dash cover look factory. If you don't look real close, you can't tell the thing doesn't quite fit in the dash, at all. It's all prepped for the future wired backup camera also, actually can handle two different cameras if I needed two.
Even if you're not going for an upgrade, one of these sorts of shops would be able to troubleshoot and tell you exactly what's wrong and write something up for you to go argue with whoever needs convincing to replace the unit.
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Pilot for fun, Computer geek for a living, and happy 5er owner who wants more time to go play in the camper!
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