PRV valves only last so long.
I've never seen a good 30 YO PRV
Is there a poly or copper service to the home, or old galvanized.
With old galvanized piping, anytime you shut down the water and restart it, it can break up some junk inside the line.
If the city replaced the meter between the two nuts, it's a simple R&R. It doesn't get easier then that. Spin back two nuts, lift out meter, drop in new meter with new washer and snug up.
But again, if the meter was older then 10 years, it was going to need servicing at some point.