Tuga,
I think you are going to find that either the solenoid valve in the manifold is leaking or the manifold is cracked. The speed control valve that you mention can only leak air if the solenoid is leaking.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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