Question: how to collect sdu logs?
Answer: Click Start (A)> Sophos (B) > Sophos Diagnostic Utility (C). ... 
Follow this step If the SDU tool does NOT appear: (otherwise, skip to step 3) ... 
Click Yes in the next window to allow the tool to run. ... 
Click Start.
Once log collection is done, you will see the message "Completed in #m ##s. ",