repair corrupted table partition

creating EM repository failed due to the error ORA-01578: ORACLE data block corrupted (file # 19, block # 22020) . check the details and got the following:

SQL> SELECT tablespace_name, segment_type, owner, segment_name
 FROM  dba_extents
 WHERE  file_id =19
 AND 22020 between block_id AND block_id+blocks-1

TABLESPACE_NAME       SEGMENT_TYPE        OWNER     SEGMENT_NAME
------------------------------ ----------------------      -----------  -------------------------------------------
SYSAUX                          TABLE PARTITION     SYS           WRH$_ACTIVE_SESSION_HISTORY

any idea and suggestion to repair this table partition is appreciated.