Where is The TCM

I was told to check the connections at the transmission control module to possible correct a shift solenoid E problem. Comes on now and then. I disconnect the battery and reset the computer and the lights go off. Sometimes they stay off for a week or two and them other times maybe a day. I'm tired of constantly resetting the computer to make the lights go out. The car shifts fine and runs great. I go through car washes and the bottom of the car is flushed with water as part of the wash. It could be a connector problem so I'm willing to look at that. Now, where is the TCM located on a 1999 ES300? I called the dealer and the parts person couldn't find it in 20 minutes and then put me on hold. I'll skip them. Bugsy