What repairs are okay for tenants to make on their own?

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I have a tenant who contacts me weekly for repairs. Some are legitimate and require a specialist, while others are trivial, such as replacing a sprinkler, and it's getting very tedious.

Which repairs can I reasonably expect or even ask a tenant to repair on their own? My instincts tell me none, but something as simple as buying a new sprinkler from Home Depot and screwing it on isn't hard to do. Thoughts?