New 5 ton Trane/Water Furnace unit operating since Oct. 2016 with no problems. Closed vertical system with flow center in crawl space. This week heard "air in line noise" and found pump housing leaking water at fairly constant drip. The pump was not changed when the new geo unit was installed but it is only 3 1/2 years old. Unit has not shut down (yet) on low flow but noise getting worse. Questions: 1. are these flow centers field repairable? 2. is it feasible to remove housing for inspection of internal piping and connections? 3. are the 3-way valves replaceable in the field? 4. is the insulation for condensate prevention only, can it be repaired/replaced? Great forum and great contributors, thanks in advance for your input.