How to air check a 4R100

Copracr

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Could you help with an aircheck question? In this picture:
aircheck.jpg

if i blow air in the black arrows' hole it comes out the red rainbow arrows' hole. If I blow air in the blue arrows' hole it leaks down slowly. The OD and L/R holes seem to hold air till I let it out but these ones leak down. Is that bad?
 

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