I can't speak for much of the base / scheduled maintenance. I could see where the minimum required might be done to push it out the door. I know when Cessna sends a list "additional items" found during inspection, we authorize repair of nearly everything.
We had a GIV fail an APU door actuator one day in Europe. Luckily, someone beat it with their shoe and got it to work. I requested the actuator get replaced when it came back before it failed again. Three weeks later I see the same tail AOG because the door wouldn't open. I asked why the actuator never got replaced earlier. Gulfstream refused because they don't replace operable parts under GMP. The point is, you see inefficiencies as do we but sometimes we don't have control. Of course we have many of our own inefficiencies, but the aggravations you see on the road aren't always our fault.
The CND issue is no fun for anyone. The guys have enough to do without having to deal with the same things over and over. There could be many reasons for a CND, some of which I mentioned a while back. Many times, we'll reposition like parts from the #1 to #2 side if we can't duplicate it. If it comes back a second time! we'll either know what it is or what it isn't.
SG