7FB

Explanation
An uncorrectable error occurred while one of the
MVS-JES3 dynamic device reconfiguration (DDR) subsystem interface
(SSI) routines was running.

System action
The system ends the reconfiguration.

Operator response
If you initiated the reconfiguration, retry
it. If the system initiated the reconfiguration, notify the system
programmer.

System programmer response
Search problem reporting data bases
for a fix for the problem. If no fix exists, contact the IBM® Support Center.

Source
Dynamic device reconfiguration (DDR)