2 known leakers on that side of a TD5.
1-Directly behind the turbo is a short stepped hose that goes to the cooler.
Either a planking plug or a hose to a pipe depending on the age of the motor.
2-Water pump, bolts to the rear of the power steering drive and has a tell tale hole in the cover plate.
It can be removed with the manifold in place but it's tight.
On the intake side check the fuel cooler end caps, the O rings in there are also weepers.
As you'll have the system drained I'd consider doing all of them in one go.
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