[DieselDoctor]

Worked 41 years in auto and heavy truck repair. Never seen a techie yet with a fancy patch on his arm that could get the information from his brain to his hands. Big deal, you passed a test. Take a call out at four in the morning at 25 below and bleed a man-lift down with the operator still in the basket and half frozen because the computer controlled system locked the hydraulics. And before you say just open the holding/counterbalance valves and bleed off the pressure, remember to take into consideration upper, lower and jib boom positions, center of gravity, load on the boom, and position of the booms relative to energized conductors. Do it quick because the operator is cold, the foreman needs the circuit repaired to put the customers back on, and do it SAFELY. Just another night at work boy. That's shit you don't learn in a book and then answer a fancy test question. It's field experience.
I'm quite certain Jon has plenty of good field experience under his belt. Who gives a rats butt if he can or will answer the questions you've posted. He knows how to do the work.