I have a 10-year old Rocky (doserless). It has been great once I learned how to dial in for variation in beans, taste, etc. Unfortunately, it suddenly stopped working completely, suggesting some sort of electrical fault. I have removed the bottom of the unit and can identify the main electrical parts. Trying to figure out what tests I can do to identify the faulty component. I have a multi-tester and a bit of knowledge but want to make sure I am barking up the right trees. Really miss my morning espresso!