Slip light,,VDC light and service light on but only seems to happen when raining on 2005 Infiniti G35

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Have Infiniti 2005 G35 and it has the slip light,,vdc light come on ,,with the service car light. It won't stall, but it will creep slowly after lights come on and so far it has happened when it has rained. We took it into the dealer and they got codes p1229 two times, p1815 and p1705.
They say they think it is the sensor power supply for excelerator pedal but are not sure and not confident ordering parts for something they are not 100% sure about. Not sure exactly what to do if the infiniti dealer is not 100% sure. Anyone have any suggestions on what to do? The first time it happened was 3 wks ago and then it happened again last week,,both times it was cold and rainy. The dealer had the car last week for 4 days and could not get it to duplicate the problem. The Service engine light is still on...Thanks in advance for any help...
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