Today, I had the same leak on the solenoid block. I has unable to troubleshoot because it was very busy and no one seems to use presoak. Which is good.
Need to change hydrominder tip from dark brown to orange. I just changed foam brush chemicals a couple of days ago. Also, was having problems with tire cleaner it was very weak.
Today, I had a fragrance vacuum that did not work. I opened the unit and noticed that the relay fell off. Of course this was behind the fragrance bottle it can not be easy.