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Yes. It’s normally red. Just have a feel with your hand to see if you can find a split or if the hose is excessively softened
If that is split that’s certainly the first thing to change. Check other side also as that’s the more common one to split.
Really should do a smoke test before diving in. Could be a boost pipe split possibly but I’m sure that will give a different code.
It’s a tricky job. About 350 from memory. Shouldn’t happen again.. we use a better bolt so never seen it reoccur.
Just a bad design. Vibration causes the end of the bolt to snap off into the engine head. It’s always the same bolt too!
very likely intake manifold stud is broken.
a smoke test will reveal. any good garage will have a smoke machine.