Originally Posted by Kontact

One of the major reasons for saving old parts is to be able to show the customer why they are unserviceable so no one can accuse the shop of doing unnecessary repairs.


In the real world, the kid making the repair might not read the repair order, or heard something different than what it says, or someone else threw away the parts while cleaning up. Mistakes happen. But shops have to pay for mistakes the same as paying for more intentional screw-ups.