Ford advance-trac 'warning' light comes on. Disables advance-trac function when in 'fail' mode. After complete shutdown and restart, the light will go away. Intermittent problem, but definitely noticeable when driving without traction control in the rain.

I'm sure this is covered under warranty, but I'm afraid to take my truck into the dealership. They will chew it up and spit it out like usual.