Hopefully this will be the end of the discussion since I have had a plumber look and fix it. It appears the "expansion" unit was the problem. When he removed it it was very heavy and filled with water. When I held the new one is was relatively light when compared to the old one. That was because it was half air and half water which is right.
As he explained it the cause of the pipe that was broken was because of the "shock" to the pipe because the expansion was bad. He said it would be good for anyone who believed their expansion was faulty to have it checked. He is an excellent plumber and is very fair in his charges. His company is "Holmes Plumbing" and his name is Charlie and his number is 352-787-9554. He is the same person who was at our home within minutes when we called with the broken pipe.
