Oilyness around the right end intercooler hose is typical of leaking O-rings. These are located on the plastic elbow that joins the hose to the intercooler socket. They are easily replaced, preferably with the Viton type which don't swell like the originals. They're available from forum traders and eBay.
I doubt you can test the integrity of the hoses. If they feel soft/flabby you can replace them with the silicone version, which are also sold as per the Viton rings.
TC
Last edited by T-Cut; 28th November 2019 at 20:08..
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