Deciper Error code for Clavinova cvp-403

[IvaLotta]

I have the following code on start-up

Force format mode
Unexpected error
Turn power off and on again

I do that and also get error message

hisysdwn.c/19117028-039

Can anyone advise what this means. Potential fix costs.

 

[happyrat1]

Check if there's an internal battery that needs changing.

Gary