Did a repair on a large property yesterday and the original call was for the #6 zone not coming on. Power was good to the Toro valve, solenoid checked out, flow control was good, and it sounded like it wanted to go and a little water was flowing, but no heads would come up by the solenoid. Open up the bleeder in top and it kicked on fine. I excavated the box and pulled the top off of the valve. Diaphragm appeared to be good but I noticed a small crack in the inside smooth lip of the seat that sits down in the body. Topped the valve, replaced seat, and it worked fine. HO asked me to run through all the zones while I was there and found the #1 valve also not coming on. Same exact thing as the #6 and, when I pulled it, it also had a cracked seat. Topped it, replaced seat, and it worked fine. Have y’all seen this before? Is it something with the hard well water? I found it odd that these valves were literally right next to each other and had the same problem, but maybe it was coincidence?