You want to know how to run the Symantec Power Eraser with the Symantec Diag (SymDiag) utility.
Threat Analysis Scan replaces Symantec Power Eraser
In SymDiag, running a Basic scan in the Threat Analysis Scan while the reputation database is available is equivalent to running Symantec Power Eraser. To learn more about the Threat Analysis Scan see:
TECH215519: 'How to run the Threat Analysis Scan in Symantec Help (SymHelp)'
TECH215550: 'About the Threat Analysis Scan'
Using Today's SymDiag to Combat Today's Threats