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Front servo pressure

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I need someone smarter than me. I feel like I'm playing jeopardy. The answer is -  when driving in 3rd gear or od front servo pressure is 55-60 until I just back off the throttle slightly then it drops to 22. Until you Rev it up then pressure goes to 55 and away I go.  All the other pressures check out just fine.  Tried disconnecting the tv cable and then holding the tv cable at part throttle. Didn't help. When I manually shift into second pressure drops to 0. 

What do I check?  What causes the front servo to engage or dis engage?

Sorry to be a pest, I'm just scratching my head. 

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