Xerox 7855 error code 303.355

[issambass]

hello ,
i have a Xerox 7855 error code 303.355

in the SM :
Power On Self-Test failure detected during the NVM Integrity Test; NVM battery dead

Procedure:
The SBC NVM battery may be loose, failing, or has failed. Reseat the SBC NVM PWB battery. If the problem continues, go to REP 1.11 to replace the SBC NVM PWB.

can i change NVM battery dead ?

[CopierTechofOmens]

Mine says: 303-355 Power On Self-Test failure detected during the NVM Integrity Test.

Which only happens if multiple failures of HDD and SD card happen and the backups are lost