[Land Yacht]

I am updating this post 5 minutes after posting...

I will add more information about some oddities and other air repairs I made that should not be related but maybe I am wrong...

Yesterday morning I turned off all air compressors, and drained both the passenger forward bay air tank and the wheel well tank. I had a leaking passenger side dump air control valve. As suggested by another guru, I installed an on/off valve in front of the leaking dump valve, then started the compressors and all is working fine on interior air systems. Almost too good as the bleed of rate is very low. So low is it hard to tell leakage rate because there seems to be none except for usage of doors and toilets.

Now for strangeness - I noticed every time I open the bode air door a weird sound is coming from between the rear wheels. I think this is occurring for any air operation, but I need to confirm. The sound is somewhere around the wheel well tank. 

Update:I just tested opening the valve I installed yesterday (red handle in pic) and running the bode door, no noise in rear wheel well. Closed the valve noise, open the valve no noise. Thus, I will leave open and try my detailed tests again. I really thought this should have no effect...