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Tiptronic Front Differential Hissing Noise

Transmission and Clutch

Model: 996 C4 Tip, Year:2003, Mileage:52000, Type of use:Street use only
I just changed the gear oil in my front differential on my 2003 996 C4 Tiptronic. When I removed the fill bolt the unit made a hissing noise as it was sucking in air. What this all about? Blocked vent? Is this supposed to happen. Help.Thanks

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