Agree with the fact that the older guys are gone that knew how things worked. I started in the '70s with telco. Folks that I learned from had started in the 1940's so I have seen quite a number of changes. Have not worked in telco since the '80s. PBX maintenance since then. Yes it's a nightmare escalating any issue to telco, total luck of the draw if you can get anyone that knows something, or better yet, wants to dig a little deeper to really figure out the issue. All of the techs today have not had the benefit of learning the older ways of diagnosis. No skill with basics like VOM, etc. They rely too much on the diagnostic computers that cannot seem to locate or identify any problems with cable pairs, bad DSP's, bad repeaters, etc. It is like a modern trip to the doctor or a mechanic. They can't diagnose "from the hip" anymore. Too much reliance on a machine diagnosing the problem.