I had those symptoms when my Valhalla board died. You could look into the DC motor kits out there for a few hundred bucks for the LP12. They get good feedback but I haven’t heard one.
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I agree to start with removing cap, spring and ball before doing anything. It will do exactly what you discribe. It's easy to do, just do it slow because spring can through ball and you will be on your hands and knees looking for it like I did. Soon as I did it problem solved. Mine did it with Pink Triangle pink link power supply not lingo.