The subsystem is offline. Is the red Alarm light on? Did you simply pull out the old SVP and insert the spare, or was the appropriate maintenance procedure followed? These types of issues are typically too complex to troubleshoot via the forum (the configuration needs to be known, SIMRCs and SSBs need to be reviewed, etc.), and the recovery procedures involve proprietary/internal information that would not get posted on here anyhow. As William suggested, you will need the assistance from a HV's support or ASP.