To get such information I had to contact the product maker and get setup with their service departments. It took a few years but it paid off in becoming service centers for a few makers.
So it's that simple. If you want canon parts and service information you start at canon.com and call the local office with your query on how to get the service information. Your newer techs may not know it's that simple.
Hello,I am technician of cameras, I repair both handy and still cameras.I needed repair tips with complete fault finding of different models of different company's cameras on line through the forum .