I have a Xantrex PathMaker 100/2-12/24V - looking at the panel it looks like the Heart Interface 100 for 2 battery banks. It is installed on my 29' Back Cove boat. The other day it sounded like a woodpecker was in my engine room - turns out it was the PathMaker solenoid. I shut it off. When I turned it on for my mechanic to trouble shoot it no longer was working - green light would not come on - stayed yellow. Solenoid was still working when he put power to it. Can you repair this type of unit ?