Incident investigations

In FTIR instrument software hangout and not able to open for user and reviewer after service engineer rectified issue but data audittrails missed how we wil proceed further for this?

Data is autosaved to server, its will be in backup file and Particular batch or all you check time period, lock the investigation. Repeat test. and Check auditrail . Ok or not. To get support from service person and IT person.

In Backup data is available how we proceed through LIR or Incident?