I'm not 100% sure whether I did the test correctly but I pinched the only hose (that looked like a pcv hose) coming from the back of the SC with a pair of pliers but nothing changed. I couldn't really hear any hissing over the noise of the engine though. I held it pinched for about 2-3 seconds and the engine idle didn't change noticeably. See the first photo for the hose I pinched.
The second photo is of the 3 hoses onto the SC itself. The bottom hose (RH PCV) doesn't have a clamp on it because there wasn't enough space to fit one in there. I only had enough space to clamp the middle brake booster line. The instructions also didn't specify whether those hoses needed to be clamped so I didn't clamp the bottommost one. Maybe that's where the leak is?
