Personally any hoses on there that are still original then I would definitely be replacing them. They can be very good at disguising any small splits that occur and more often than not it happens just in the spot out of sight. I'll assume your bottom intercooler hose is in good shape as that one gets a lot of stick. Intercooler itself OK?? These can crack, but it's rare.
I guess you could give your waste gate arm a tug and make sure there's good resistance on the spring, or in fact that it's free-moving. These should have a fair amount of resistance under finger pressure. Also when you say Pierburg TRV, do you mean the TCV on the side of the air box?? I fitted a Forge Motorsports uprated TRV which also gives a bit of extra performance.
I'll also assume the little vac elbow above the alternator on that end of the engine is in good shape??
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