Casio PX-720 - ROM version check

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Caution while assembling the keys.
• Set the key as shown in figures below.
4. Remove 8 rubber keys.
* One of the keys has the different length from others.
5. Remove 9 screws then the MCPZ-KYA1 PCB.
6. Remove 11 screws then the MCPZ-KYB2 PCB.
7. Remove 9 screws then the MCPZ-KYA3 PCB.
How to install the rubber keys.
MCPZ-KYA1 PCB
*SCREW x 9
MCPZ-KYB2 PCB
*SCREW x 11
MCPZ-KYA3 PCB
*SCREW x 9