Either find the soleniod grid on Dave's site or look for a post by me "trans info" There are links in there that have the trans soleniods listed. I'd say it's a soleniod issue as well.
Thing there is.. it may be a wire leading to the transmission. You'll want to double check the pins and connectors/wires before going at the trans itself.
If you need to go into the trans, you can do it w/o pulling it out. Dropping the subframe and lowering the drivetrain a bit, you can get the cover off the side and change the soleniod and or internal wiring.
