WG problems - testing

[Ameer Antar]

So I tested my wastegate by putting vacuum on the small barb on the upper chamber of the WG. It seems to hold vacuum fine, but I didn't really notice a thud, just sounded like a diaphragm slowly closing up. Is this the only test that should be done to test the WG? Is there possibly more than one fail mode? The problem I noticed when I ran the engine was that there seemed to be a hissing sound like a vacuum leak coming from the area of the WG. I'm pretty sure it was the WG as I've replaced 90% of the intake/vac hoses in there, but I can't be positive. Should I open the WG in trying to find out if it's OK, or will I just be opening up a can of worms? Any advice much appreciated. TIA.

-Ameer