Been out in the motorhome for the second time only to find that we could get no gas even though the bottle was full and all taps were open. It now looks like the valve is the culprit as no gas is getting past it. I have been informed that there has been problems with oil leaking from seals and causing problems has anyone else come across this. The motorhome is only 13 months old so the valve will also be the same age. There is a black plastic cap on the side of the valve and what looks like a yellow button which appears to be solid so not sure what it is for. Any advice would be apreiciated.