You don't need to execute the YY53LNKX job.
Please check the QI86575 information. It is written as follows;
QI86575 - COVER LETTER CA-PANEXEC 5.3 SP2 4.
The YY53LNKX job is no longer needed. PANLINK is provided already zapped for the Linkage Editor processing with CA Panexec PANLINK program.