Re: Clause 7.5, 8.2.3 and 8.2.4
Good question.
7.5.1 is likely the best choice. 7.5.1 is control of production, production needs to take place under controlled conditions. Although there is a list of topics that may fail in 7.5.1 a-f, anything that interferes with production control is fair game to write a nonconformance for.
Generally speaking, 8.2.3 mainly refers to your core processes or business processes. I don't know what yours are, but common ones may be management, sales, production planning, purchasing, and production. What seems to be expected today is that your quality objectives or other indicators are used to monitor those processes. When one of them isn't functioning as expected, you are expected to take corrective action. There is a lack of clear definition in the standard as to just what they mean when the word processes is used.
At times, they are talking about those core processes as mentioned above, and at times they seem to be talking about product manufacturing processes such as how to assemble a part, how to solder, how to machine a part, and so on. Element 4.1 seems to be mainly talking about the business processes until you get down to outsourcing where it could be either one or both. 7.5.2 seems to be mainly about product manufacturing processes, those that you cannot tell the outcome from ordinary verification so you need to validate it. Examples of things that usually fall into 7.5.2 include welding, soldering, brazing, plating, and heat treating.
5.4.1 on quality objectives where it talks about them being established at relative functions and levels in the organization seems to be talking about monitoring the business processes.
8.2.4 deals with inspection.
I hope this helps.