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Could be a bunch of things, wiring fault (short, loose pin in a plug, etc.), harness rub through at a belt or body, bad ECU, bad TCU, or possibly even just a random glitch. The car may have woken up from sleep badly and encountered a low voltage or other goofy condition. Low voltages in these cars will wreak all kinds of havoc and throw all kinds of incongruous codes.
If you still had the car, I'd suggest pulling the negative battery cable and letting the car sit for 20-30 mins to reset the computers.
Sounds like the dealer knows what they are doing, so you're in good hands.
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