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My Ranger's vacuum leak

1995 4.0L, 4x4, 5speed manual transmission, 205k miles. I have a vacuum leak that seems to be where the tube enters the upper intake manifold coming from the EGR valve. As best I can see the plastic plenum and the tubing appear to be intact and corrosion free, although I haven’t yet seen the engine side of these. My Haynes manual is no help with this.

Is there a seal which may have failed between the tubing and the plenum? Are these composite manifolds on the 4.0 prone to cracking in this area? Any other ideas?

Any help would be appreciated. TIA