Analysis of this maintenance phenomenon is part of my day job and this is true to a point. However if there are diff problems it is unlikely subsequent A/C problems are related as an example. However poor quality control in processes and people can lead to issues that are unrelated and partly explain why some cars are prone to numerous faults.  
 
The other side of the equation is always the operator and I find this the biggest contributer, not that I am suggesting that in this topic 
 
 
I am always cautious when the operator knows best, of course supported by businesses and magazines making a profit, and begins the modification route. I fixed the axles, then had to fix the diff, then the  clutch, the transfer case, the the radiator,  the turbo, the engine etc etc. Is it any wonder they are unreliable?
 
A recent conference quote: "Machines don't die - they are murdered"
 
Rant over

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