I appears that my Vanguard (Viega) Manabloc has some areas where pressure is still good and others where it is cut to a trickle. All valves still cycle, all valves are in the open position. External Hose Bibs still have full pressure (actually a bit higher than normal), Master Bath Lav has regular pressure (Hot and Cold Sides) but rest of house has restricted flow. Master Bath Lavs are top controls on pannel. Exterior Bibs are on 4 block at the bottom that appears connected but kind of separate. ManaBloc is a 26 port model with 11 hot and 15 cold. Is it possible to develop a spontaneous blockage that would cause this? Nothing gradual to this problem. Happened last night after kiddo filled a bathtub.