Over all system check. After running through the system we found a broken head in zone 3. We replaced the head with a 6in PRS head. Main reason for the call was the front right side of driveway was not coming on. We checked and made sure the wire through out the system and the solenoids were all giving a good reading. All the wire checked out so we determined that the Hunter valve had failed closed. We cut out the Hunter valve and replaced the valve with a rainbird DVF100 valve.