Hello, my name is***** to Justanswer! Give me just a few minutes to look up some specifics, I'm working on this now.
The first thing I need you to do is have the power supply tested. Capacitors can leak when they sit without being energized. Start there, and tell me what you find. It could be inside the module, but it may be as easy as just replacing the power supply.
You can have it tested at any electronics repair shop if you do not have a multimeter.