[JTS]

Sorry to here , another member here has a Thread same thing , I think he's repairing his same harness. I've used this Header Turbo wrap before, on my 1970 Camaro fuel supply and return lines, that were close to the passenger side Header. The headers were jet hot coated, and as stated above after sitting off for a bit you could touch , but not running (personal experience) and the engine compartment didn't have no where near the components in our cars , to hold the heat and very little air circulation.
Is the Dealership going to add protection wrap or relocate or both to the area? Also ask the Dealership if the job there doing is under warranty. A suggestion.
Or are you going to remove and reinstall the stock manifolds . That would be horrible if happens again. Sorry for your misfortune. TC