The component goes on the bench, is opened, measured and judged. Afterwards you know what is wrong with it, what putting it right will cost and what it will be worth once done. Sometimes the honest answer is that the work does not add up — we tell you that as well, and we tell you beforehand.
This is the technical assessment of condition, carried out on the component itself. If what you need is a written appraisal for an insurer, a damage claim or an estate, that is a different document for a different purpose — you will find it in its own section below.