I would suggest you open it up so you can access it from your house in case he requires troubleshooting. There nothing as frustrating having to talk someone through troubleshooting over the telephone…
I know this is a bit of a risk, but I’ve seen a few threads here that talks about allowing access from the internet while staying relatively save.
It is something I still want to do as well, but first want to get the Pi stable. I’ve also been having issues with the irrigation at midnight + my gmt setting and where my irrigation was out by 12 hours for a short while. The time was not stable but it seemed to always fix itself, I presume after an NPT check.