Thanx for responses. Will contact D & N to set up appointment. Have checked everything I can see in basement behind sliding doors..nothing found. Didn't flush with black tank valve closed. We'll let D & N look at it. Never had any sucess calling DT..they never return calls..have given up on that.
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2008 F-450
Aftermarket Brake Controller
2007 ES 36RE3 # 3702
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