Wecome to the forum from Washington state. Our year model coach did not come with USB outlets so I cannot help you. Performing a quick Google search on the topic return lots of similar complaints and appears to be a common failure of the part.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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