Walt,
HMMMM
I wouldn't get carried away thinking that the person that you've been using to repair your MTH products isn't a "real MTH tech".
MTH school, which I've attended twice myself, teaches how to diagnose MTH products and effect repairs on, primarily, a parts-replacement basis. The subject of component-level repairs isn't really in the curriculum.
People like George (GGG) are a cut above in that they have made it a priority to be able to effect component-level repairs. George has been an authorized MTH tech for many years and I would trust him with any component-level repair of which he felt confident that he could effect. He has made an investment both in additional tools (soldering rework station, etc.) and also taken the time to educate himself as regards exactly what components do what on MTH electronics.
Guys like George are a cut above most other MTH techs as regards component-level repairs. Others, such as Marty Fitzhenry (who has been an MTH tech since dirt was new), are among the very, very best at diagnosis of a plethora of MTH possible engine issues. He can figure out the root cause of most any MTH engine problem and prescribe a solution.
Holding others to the standard that guys like George and Marty set isn't really fair. These guys are exceptional.