I have 2 sets of Tusa Liberator TR-200 regulators that I purchased in the late '80s. They have worked well through the years but when I took them into an LDS yesterday for annual service I was told the parts have been discontinued and they only have a couple sets left. Is this true? If so is there any type of trade in/up program? Hate to retire these things due to solid reliability and sentimental reasons (wife and I's first set of regs). Also, can you give the specs or a link to the specs so if I have to move on I have some idea of the numerical performance so when looking at replacements I can make rough comparisons?