Gentlemen,
My thanks for all your help. I will get around to further investigation, but at 83 years old I am doing good just to be roasting and trying to make espresso. Repairs and unfortunately maintenance are not my forte. I haven't ever backflushed. I did put a package of durgol cleaner through it a while back. Thought that was all that was needed. If I can get it working, I may give it to my son-in -law who said he wished he had a machine a while back after tasting some of my brew. I think the group head plate holder is plugged so that the only place water can penetrate is the screw hole. I will look up my allen wrench set and remove it and try to clean it. Hopefully that will do it. I can't see myself opening it up and taking pressure fittings apart to test for pump flow. If it is the pump, out it goes...I've had a fancy deep fryer for a year that I never used because my wife says there is no room in the kitchen as it is. I'll try my hand at deep frying and stick to the Aeropress.
Pete