Missing embedded diags

I have a R320 which has started blinking the Health Indicator light recently.  Assumed it was a fan so pulled the cover and all the fans are working.  Brought up the box and tried to go into the embedded diagnostics and it appears they are missing.  Get the message "Diagnostics not available".  Anybody got any suggestions on how to add embedded diagnostics to a machine?  Or any idea how to diagnose the problem without the diags?

It's a 5 year old machine yes.  Probably should be replaced.  But around here they are not broken in until they are 10 years old.

Thanks in advance to anyone that can help.

Montie.