My Dad told me he had the tranny fluid and filter changed last year, and I checked the fluid when this was happening. Fluid was at the right level and clean as can be on the dipstick. I though maybe it was that too.
The temps were probably in the 50's or 40's last time my dad came over and the thing sat int he driveway for an hour. Went out...and it would not engage drive.
There was a similar post onthe Edmunds forum...but no one ever responded to the post.