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Hiya
If it is leaking from the back cap (valve body, page 15 from the manual) it is worth replacing the last (outer) o-ring #20 nbr 70 and see if that stops the leak. What might look like a good o-ring to the eye could have a little nick and cause a leak. If it is still leaking it may be worth then trying a #20x2 o-ring.
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