If the rubber valves are ok it's likely to be ok .if you pull the two rubber pipes off which go to the rear when idling there should be no suction but rev it up to 1200 - 1800- rpm and one of the valves should click and you should have vacuum at one port . ( The other port is for changing down when braking or low ratio hold switch is on ...
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 My comments are only based on my opinions and vast experience .
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