Is a quick way to find specific information in a technical manual?

If you're lucky, the technical manual will be in digital form and you can use the find feature of your document reader. If you do not have a digital copy, you may try the manufacturer's website. Many companies have the manuals in digital formats.

If you cannot acquire a digital format, then it depends on the number of words you can read per minute and how many pages are in the manual. Aside from the table of contents and the index, it may be a good idea to read the entire manual. You may even be able to contact the company and request a digital copy OR ask them if you could type your version up and share it with the rest of the world.