Zone 1 of our sprinkler isn't turning off. Wife had to turn off the irrigation valve in the box in our yard to get it to turn off. She noticed setting 1 has been running for 50 minutes, and apparently even it ran as the system switched to the other zones I think..... Which means the pressure would have been very weak on the other zones, unfortunately.

What's the issue here? Something I can easily fix? I do know where the valve box is for zone 1 in the yard. My wife went to look at it and it's full of water, but I'm not sure that's a problem. We just had zone 1 issue fixed about 4 months ago because it wasn't turning on and I'm pretty sure the guy replaced a valve or something.

Would like to avoid another expensive service call if I can....

as others have said probably bad diaphragm...cheap $5 fix, but you'll have to know where your valves are.
First time it happened for me, I realized I didn't know know where they were. I rented a ($50 rental) "sprinkler valve finder" from Redtail Rentals and found all of them, then made a map of them.

I imagine a a sprinkler company would charge over $100 to fix it, if not $200.

Since that first time it happened on other valves and I was able to go to Lowes and buy the diaphragm and fix within 5 minutes.

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I imagine a a sprinkler company would charge over $100 to fix it, if not $200.

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Definitely $200 + with the mandatory service call.