A wise post Aerial.
That is why when I look for an AMO for my GA aeroplane I do not look for cheapest, as the airlines do, I look for someone who is capable of doing the job to 1) My standards 2) The authorities standards and 3) His standards. I always expect the last to be the highest of the three.
I have found these guys over the years, and they are stars. They are rare, and when the word gets around who they are they have a hangar full of work, whereas the guys at a field 100k away can go out of business. I wonder why.
It is up to the owner of the aircraft to ensure that his aircraft is serviceable for flight. Not CASA, they are on the boundary picking up shots that cover point missed. You the owner are the infield.
I mentioned this before a couple of years ago but if you think you have a bad deal with CASA, try the the others. I have worked with several CAAs around the world and for all their faults CASA are better than most. Frustrating, but capable.