If it’s hoses inside conduits you should have water coming up from inside the conduit that houses the leaking line
This^ plus, the reason for these manifolds is to enable shutting down one fixture at a time to allow service or repair in an emergency. (Also to reduce the lengths of full diameter pipes). Hopefully the manifolds are accessible and have individual valving. Then it is a process of elimination. Be sure it is water lines and not radiant heat.
The manifold is accessible.
Water leak has been found and it was an RO line to the kitchen sink leaking.
But while trying to narrow down the source of the leak, the manifold valves started leaking. So now we are waiting for a new manifold to replace the old one.
