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The DC by level from CRB page 503 or this AoN page for their item level.

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To translate that to practical advice: to repair higher level shields like sturdy shields, someone needs to be actually good at crafting. Because the DC to repair a L4 sturdy shield is already 19, and the next one, the level 7 version is DC 23. So by that point you need to be actually good at the skill.
That's why my paladin actually took a good intelligence and raises Crafting as one of her first skills at level up.