We have a SQL server DatabaseIntegrityCheck job to check the SYSTEM_DATABASES, and it shows an error message below in the logs now:
Msg 2570, Level 16, State 2, Line 1 Page (1:354), slot 28 in object ID 58, index ID 1, partition ID 281474980511744, alloc unit ID 281474980511744 (type "In-row data"). Column "name" value is out of range for data type "nvarchar". Update column to a legal value. CHECKDB found 0 allocation errors and 1 consistency errors in table 'sys.sysbinobjs' (object ID 58). CHECKDB found 0 allocation errors and 1 consistency errors in database 'master'.
Recommendation is to install SP4 - already done and problem still exists.
Any thoughts please other than rebuild master - no backup available unfortunately.