I gave the hoses a cursory check, The rubber connectors seemed to be tight, pliable and intact. Some hoses had chafing marks and one of them, one of the small diameter hard ones going from the manifold to the canister, was worn almost through the casing.
I made temporary repairs to the chafed lines and will see if that solves the problem. But, because of the intermittent nature of this issue it may be a long time b4 it happens again.
There are no pictures of the PVC hose in my manual. does anyone know where I find one.