The propane is still leaking. I poured soapy water over all the connections I could see and no bubbles. Chris suggested going to a local hardware store where they keep lists of tradespeople to help with projects. We did that and we found a local plumber who said he knew propane. It seems that it is not a separate trade in Mexico but is done by plumbers. The plumber and his helper showed up and basically did what I had already done. They tested the obvious connections for tightness and checked all the connections around the tank with soapy water. He tried to convince me it was probably the fill valve where sometimes a piece of foreign matter gets stuck during a fill. He cleared this by sticking a small screwdriver into it to cause a jet of propane to come out, clearing the valve. I was sure this was not the problem as I can stop the leak by turning off the shutoff valfe which is not connected to the fill valve.
Anyway, he seemed to be at the limit of his abilities so we paid him $100 pesos or about $7.75, his asking price for a house call. He actually did not ask for $100 pesos. Instead he told me to pay what I thought he was worth' Juan told me to offer him $100 pesos. Try to get that in Canada ot the US!
He suggested leaving the valve open and to call him back if the problem returned. Well, it returned but we are not going to call him. I don't think he is all that familiar with propane systems in RV's where connections are hidden.
We are going to do without propane until we get to the USA next week. The only time we need it, or at least use it, is while moving to keep the fridge working. Many people turn their fridge off while they travel as they are afraid of having propane open in case of an accident. We (and most others) have never worried about this and travel with the tank open. It will not hurt to turn the fridge off for a few hours as long as we keep the door closed. We just won't be able to boondock along the way to San Antonio, TX where we will get it fixed.
More Important Stuff:
Our friends Chris and Juan have left as Juan had something he had to attend back in Monterrey. It was great to see them! Chris keeps saying he is "almost retired" but takes the odd contract from the publishing house he works for, traveling around Mexico training teachers and presenting new school books. Juan is also "sort of" retired but is working on his Doctorate in Education. His specialty is kids leaving high school before graduation in both the USA and Mexico. Perhaps his studies and work will lead to a solution of this problem that knows no borders!