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Did you check in the roadside service bays? This may have a detachable cord. The cord should be on the rear or the roadside. Never in front or the curbside. If it is detachable, there will be a square outlet with a cover about 3" square and the cover flips up. I can't believe an RV tech couldn't find it! If you are having trouble, attach a photo of the rear area and the roadside and let me see if I can pick it out for you.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?