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@benbrangwyn
Depends what you mean by slipping. If it's chain slip, it's likely to be worn cogs on the cassette. If they're the ones you use the most, they'll be the most worn and the likeliest to slip.
If it's slipping from one cog to the next, ie slipping gears, in that area when all the rest are fine, you may find it's a bent derailleur hanger.