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So the truck came back from that dealership. They had replaced the EFI relay, but otherwise couldn't reproduce the problem.
Wouldn't start again on Wednesday night, had it towed to another dealership. They've replaced the negative ground harness at my request, and have been able to reproduce the cold-start problem. It's still there, and it sounds like they're not having any luck, either.
Last I heard they had traced it down to voltage fluctuations around the certification ECU and were going to debug that further, checking the input to that cert ECU. The voltage coming out from the cert ECU and going to the starter relay would be a low 8v when the truck is having the problem, and the specs call for at least 9v in that scenario. That's all I know, no updates since Friday.
Getting pretty desperate for ideas/fix at this point...
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