904 won't go into gear. Sometimes. :(

Hi guys!
My race / street 904 with tci kit and trq converter has about 30k on it. It's acting up. On occasion when I start it it it won't go into gear. Cycle through all gears nothing. And then boom it works. ???
The strange thing is once it goes into gear it shifts fine. Burnouts, second gear scratch, down shifts strong as ever. Please advise.

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