Well I got my car back this morning from the dealer. Long story short, the tow truck driver did leave the car in "N" and the hybrid battery was completely discharged by the time it got to the dealer. Because of this the tech never saw the "check hybrid system" message. They charged the hybrid battery over night, re-calibrated the computer, and this morning the car was fine. They drove it 50 miles without any problems. I don't know what the heck happened, but I've got my ride back and it's running smooth as ever.

The only thing I'm a little worried about is that maybe by discharging the battery it reset whatever other problem was going on. I hope it doesn't re-occur!

In regards to the hybrid battery and letting it sit for awhile. I was wrong when I said every couple weeks it needs to be charged. If you look on page 10 of the owners manual it clearly states: "If the vhicle is parked for a long time, the hybrid battery will discharge gradually. To keep the hybrid batter in good condition, drive the behicle at least once every several months for at least 30 minutes or 10 miles."