I went many years as a Service Tech and never had a clue as to these rules. As a matter of fact I went years as a Service Manager, and quite a while as an Instructor, without seeing these all in one place. I had this problem with learning the hard way - who knew you could pick up a book (or read a blog!) and learn this so easy? If you haven't been able to tell, I am all for giving this type of information to those that need it; so please share with your service managers, techs, sales, and even the greenest of tin knockers.
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