The Designjet T610 or T1100 service error 08:11 are a common error for these printers.
Regretfully, HP did not engineer this error code to specifically identify the part that is defective.
To HPs credit, they did engineer later models to provide more detail feedback.
Here is the frustration, the 08:11 service error requires a 'best guess' approach.
The defective part may be one of the following:
1. Defective Hard Disk
2. Defective Formatter Board
3. Defective Main Board
4. Defective Fan
5. Defective Control Panel
Replacing the HD and\or Formatter Board is easiest to trouble shoot.
Replacing the Main Board and\or Fan is time consuming with dozens of screws to remove and reassemble.
I can't personally confirm the Control Panel fixed it. Never got to #5 on the best guess list.