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Close-up of various components near the heat exchanger:

• The large-diameter pipe in the lower-right of the photo is the no. 2 fuel high-pressure duct.
• At left-center is part of the turbine exhaust manifold.
• The heat exchanger occupies the center of the photo. The two small-diameter lines near the bottom leading to the two left-most connectors are the helium (bottom-most) and oxygen supply lines. The two larger-diameter lines leading away from the upper connectors are the helium and oxygen return lines (it's hard to tell for certain from this angle, but it appears that upper-most line is the oxygen return and the one just below/to the left is the helium return).