How do you replace a dead internal battery in a Roland guitar synth?

I own a Roland GR30 guitar synth, and the internal backup battery died. Does anyone here know how to replace it?How do you replace a dead internal battery in a Roland guitar synth?It probably comes with a standard CR2032 battery, you can find in watch and department stores. Replacing the battery isn't a issue, just like any other equipment, except that you need to unscrew the GR30 cover until you can see the motherboard and the battery.