Hi, I am struggling to find the fix for this APAR to address the following issue prior to upgrade: "1c.iv) xlC.rte Fileset If migrating to AIX 5L Version 5.2 from AIX Version 4.2.x or AIX Version 4.3.x, check the level of the xlC.rte fileset with the following command: lslpp -L xlC.rte If the xlc.rte level is earlier than 5.0.2.x, you must apply APAR IY17981 before migrating to AIX 5L Version 5.2. Without APAR IY17981 installed, the migrated system could fail to boot. APAR IY17981 is available from the following AIX Electronic Fix Distribution Site: http://www.**--****.com/ " Frankly, I can't find anything related to this on the current support portal, nor the new one just being introduced. Anyone have any ideas or experience of this?