Methodical wrote in post #17768128
They need to get it right or they will continue working on the same camera over and over again,
This is true, but getting the same tech a second or third time around to pick up on the same problem where they left off will be near impossible and I don't believe you could even request it. They are probably a hundred + returns to process a day !
Therefore, your return is just a new camera with a new problem on a new day. The object is to move it along, 'cause time is money.
We call these people "techs" and I want to think the best, but having worked in a factory environment, I have a different picture in mind....
Not sure many of them are thrilled or interested working on a $2 -7K camera that a guy sends in with his $2K lens complaining that the pictures he is taking seems to blur the 2nd & 3rd primary feathers of your bird in flight pic ! 
I'd be willing to bet the cost of your gear represents 2 or 3 months take home wages for the average tech.
They are only regular people doing an hourly job.
I don't think any one of them is really looking too deeply or is particularly interested in getting to the root of your (our, my) problem.
(Is it almost break time ? Man am I hung over.... ) They will once again, run the standard tests because the screen says, when the issue is this, you do that. If it passes their procedure within spec, they will push #4 on the computer screen which prints "electrical adjustment" on the slip and it goes down the line to shipping and out the door...... and if you're a CPS member there is even less time to really look at things because they promised to get it back to you in the blink of an eye.
For my money, they could keep the goods for a month if I got it back doing all it's tricks 100 %.
Average consumer (me) calls it a day after a couple go-rounds satisfied or not and it's case closed.