How do you replace the first two chars in field for two?

Category : Databases
We have had a script running that enters codes into a stock field, but with two additional characters at the start, such as this:
I want to replace the "es" with "fr". There are hundreds. I'm sure there is a 'REPLACE' script but cannot quite work out how to do it. I'd say it should do it only if it finds 'es' as well, in case there are some where there is no 'es' in there.

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