Pls let me know if this needs replacement or repair
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While this looks quite minor, it is absolutely impossible to tell what damage has been done to the cord/belt structure underneath that gash.
This question has been asked many times before, with many different pictures.
The yes/no answers are always opinion-based, and in fact always wrong. The only correct answer is that it is impossible to tell without a professional evaluation - and even then you are gambling.
Advise based on a few pictures should not be given by an ethical mechanic.
On edit (after question was edited):
There is no legal "repair" of sidewall damage in most countries. I would be very suspicious of any shop that claims they can. The liability is tremendous . . . any legit mechanic taking that risk clearly has little to lose.