Just an observation here: If the temp maxed out at 171*, your butt will never rise above 171*. Seeing that 171* is in the plateau, there's little chance that you could finish it off in the oven in "15 min max."
As Tom says, do verify your therm. Call CS if you can't get resolution quick!
Can't tell from the response, if the 171 was the temp of the meat, then it's in the plateau and just let it go longer to finish, it will zoom past it ONCE it finishes getting through the plateau.
Check the temp of the smoker... empty.
The fact it's hitting the plateau should have zero issue with the temp of the smoker.
You should set the smoker to a temp, say 250 and see what it registers at.
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