I learned to check my sprinkler system from YouTube. It will show you how to check each zone manually in day time. Also, I learned to change a broken head. Very easy fix.
The sprinkler guys charge about $35 to check but they will also find a few heads that they say need to be replaced to make it worth their time.Charge for each head change is about $40-50.
You really need to learn how to check you sprinklers yourself, it's very easy.
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