Doing a repair yourself can be sensible for some jobs, but the part you take out may be the strongest proof of what failed. Administrators and inspectors sometimes ask to see the removed component to confirm a fault. Some papers say that replaced parts must be kept, labelled, and returned. If you throw the part away first, you may have no way to show what was there.
Check the paper before you open anything
Search your contract for words such as replaced parts, return, retained, salvage, and who may perform the work. Read the clause on who may do the repair alongside it, because a self-repair may fall outside the permitted work even when the part itself is covered.
Record the part in place
Photograph the component where it sits, before any disconnection, with a clear view of its label, part number, and serial plate if it has one. Note the odometer or hours reading. Keep a written note of the order in which you removed fasteners and connectors, so that the job can be checked later.
Choose a route
One route is to call the administrator before the swap and ask whether the part must be kept, whether photographs are enough, or whether an inspection is needed first. A second route is to have an independent shop look at the removed part before it is discarded, and to confirm in writing who pays for that look if the claim is not paid. Pick one, and write down the answer you got.
Check the safety rules
Some repairs involve fuel, brakes, electrical systems, gas, or structural parts. Check whether your paper, or the rules where you live, require a licensed tradesperson for that type of work. This is general information, not professional advice. If you are unsure, ask the regulator named on your state page, or a qualified tradesperson, before you begin.
Label and store the part
Put the old part in a bag, label it with the claim reference and a short description, and keep it dry and out of the weather until the administrator has said what to do with it. Keep the bag with the photographs and your notes, not in a different room.
This edition has not read any particular contract, so it cannot say whether a given paper requires retained parts. Use the steps above on your own paper, and let the written answer from the administrator decide what happens to the part.