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Interlock on 99 Tiptronic, Need Help...

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Hi, i posted my problem but didn't get a reply, The interlock on my car wont release, if i play around then it will and i can move the shifter from Park to Drive, I need to locate the Tiptronic control module, any one knows where it is? Here is what i was told to look for.

This is often Caused by either a faulty brake light switch or a faulty tiptronic Unit The shift interlock solenoid gets powered up but doesn't get a full ground most of the time. Sometimes it will go to ground and the solenoid works. you need to verify brake light switch input on pin 10 of the Tiptronic control module Black/orange wire. The Black/yellow wire at the shiftlock solenoid should be powered key on engine off. The Red/Brown is the control wire switched to ground by the Tiptronic Electronic Control Unit. If the brake light switch input to the Tiptronic electronic control unit is okay and power to the solenoid is okay, then disconnect the connector at the solenoid, check resistance, 60-90 ohms. If okay, apply power and ground to the solenoid at the disconnected connector to see if it activates. If okay, it is a possible Tiptronic Electronic Control Unit problem. Further testing requires a Porsche system tester to perform activation testa on the Electronic Control Unit

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