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I was just explaining this to a customer of mine who just had a new engine installed by a up and coming shop. I showed him that its a sign of people who double check their work and dont assume they got it all right because they have been doing it for years.
People make mistakes and miss things the first time around. A proper checklist and double check method shows it was probably done right and these oversights still get fixed before the car rolls out of the shop
Dave
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