I second the leaky seal at the electrical connection. If it has been leaking for a while it could wick up the wiring harness and cause the circuit board to be sitting in a pool of trans fluid. Also the trans fluid will be too low. Check the trans fluid level and have a look at the circuit board for traces of trans fluid.

Have a look here: http://www.peachparts.com/shopforum/showthread.php?t=234219&highlight=Trans+fluid+leak

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles