Cliff, I agree it sounds like a regulator problem. I replaced mine as well. I installed two propane pressure gauges (about $15.00 at Walmart). With these installed, I found the system would bleed off gas within 5-10 minutes of closing the valves on the tanks. I could also smell propane in the tank compartment. After the new regulator, my pressure will stay in the system for at least 24 hours before bleeding off once I turn off the tanks. This is now an inspection item before each trip.
I don't know where the gas bleeds out at but I assume it is at the appliances (although I never smell gas inside the rig).
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