There are plug in testers for 7 pin connectors available at most anywhere that handles trailer parts.
Sounds like your dealer has checked out the truck. I think you need to have a digital VOC meter with you. Check ground continuity to the trailer thru the connector.
Most rv shops have a test rig that they can plug into your rig pigtail that will quickly verify if the brakes are working. It's easy to check yourself as others have noted.
If they have worked, I would be looking for corroded connections or something rubbing a wire.
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2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
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B&W Turnover ball, Companion Std hitch
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