The first step to be able to service this display will be to identify any the issues with the video wall.
To do this, we will need to review the Status export from the Master ECU and note any physical issues with the hardware.
From the status export, we can identify any software faults or required upgrades, check on the internal cable connections, identify fan failures and general operating status.
From physical inspection, we will be able to identify if there is any damage to screens, or if there are any performance issues with the display.
Depending on results to the above, we would need to quote for any parts required, which will be made up from fans, power supplies, and Light Engines.
All hardware replacements, if needed, can be handled on site.
During a service visit to site, it would also be advisable to carry out cleaning of the hardware.
With this in mind, I would suggest the following is required:
1 day on site to gather status information and perform product inspection
3-4 days on site for cleaning, part replacements, software upgrades etc.
As this is in a critical location, do you think it will be possible to get the initial troubleshooting information required? Without this, it is very difficult to propose any budgetary details for the service.