curious shawn

I bought my Gaines vending machine vm-750B snack machine in 2007 I had it in a breakroom in a office building for about 1 year took it out and it sat in my storage unit for 11 years, then I finally plug it up and at first the dollar bill acceptor and coin changer was working for about 2 days then all of a sudden it wouldn't take dollar bills or coins the bill accceptor is blinking with a red light flashing every 3 seconds so where do I go from here