I solved my problem with a major MacGyver move. The frozen pipe is in a vertical service tunnel and we can't reach it. So we got our shop vac and turned it on to blower mode and poked a hole in the wall to put the nozzle in. I blew ambient air from my home office down into the tunnel and within 10 minutes the pipe thawed.
I'm going to be running the shop vac every half hour for the next 2 days, but at least the pipe isn't frozen.
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