I am getting no sample water error. I have verified absolutely every sample and waste line is clear. I got in the inside and even verified all lines are clear. I’ve determined when I try to push water that runs through solenoid 3 to solenoid 4, it does not pass through , even though the lines are clear. I pulled the lines out of the solenoids, no luck. This means the manifold has to be clogged. How do I clean out the manifold or is it possible to get a replacement manifold? Thanks in advance.