SQL Server 2005 SP2 installation failed on Active/Passive Cluster

SP2 fails to install database services - MSP Error: 29512 “Unable to install Windows Installer MSP file”
Errors from Summary.log
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Product : Database Services (SQL084)
Product Version (Previous): 2153
Product Version (Final) :
Status : Failure
Log File : C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Hotfix\SQL9_Hotfix_KB921896_sqlrun_sql.msp.log
Error Number : 29512
Error Description : MSP Error: 29512 SQL Server Setup was unable add user pbs\csparq_service to local group AU\SGG-GM_ServiceAccounts.
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Configuration failed.

One or more products failed to install, see above for details
Exit Code Returned: 29512

Errors from SQL9_Hotfix_KB921896_sqlrun_sql.msp.log

MSI (s) (68:4C) [00:21:37:156]: Product: Microsoft SQL Server 2005 (64-bit) - Update 'Service Pack 2 for SQL Server Database Services 2005 (64-bit) ENU (KB921896)' could not be installed. Error code 1603.

Additional information is available in the log file C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Hotfix\SQL9_Hotfix_KB921896_sqlrun_sql.msp.log.

Local group AU\SGG-GMRISK_ServiceAccounts doesn't exist
Failure adding user pbs\acoe_csparq_service to local group AU\GMRISK_ServiceAccounts (5)
Error Code: 0x80070005 (5)
Windows Error Text: Access is denied.
Source File Name: sqlca\sqlsecurityca.cpp
Compiler Timestamp: Sat Oct 7 09:43:41 2006
Function Name: Do_sqlGroupMember
Source Line Number: 1132

MSI (s) (68:4C) [00:21:37:156]: Note: 1: 1729
MSI (s) (68:4C) [00:21:37:156]: Transforming table Error.

MSI (s) (68:4C) [00:21:37:156]: Note: 1: 2262 2: Error 3: -2147287038
MSI (s) (68:4C) [00:21:37:188]: Transforming table Error.

MSI (s) (68:4C) [00:21:37:188]: Transforming table Error.



Workaround: