Actually, I don't do that any longer. It became so modern that red light on circuit board means replace. What was a $50k job in 1980, became a $40k job in 1992, when I got out. Now the equipment I work on uses basic old communications protocols like RS-485, but my job is primarily mechanical anyway. I simply believe I would have a better job if I worked on aircraft than what I do now. Don't get me wrong, my job is rather satisfying. It's just it doesn't require my level of expertise, and I don't have the background for a technical job that is also low risk of layoff. Aircraft mechanical or avionics might have been the ticket for me. Oh well, have to live with past choices.