Air Leaks

[David and Teresa]

Just brought my coach home from service and I had leaks in multiple places when arriving home. Among several small items I had fixed was new rubber seals on the toilet. In order to do that they had to let the air out of the system. Pulled in my driveway and parked and I could hear air leaking. There were 2 places I found. The first was in the front bay under the copilot. That was solved by tightening a connection. The second was in the manifold that feeds one of the air-operated dump valves. With both of those repaired I was sure I fixed the problem. But no. Though I can't hear any leaks anywhere inside or out it only takes about 20 minutes before the coach is out of air. The dashboard guages show the brake air holding. What could they have possibly done at the shop to cause this?