One thought:  Look for the value in the SDWABEA field.
This is the "Breaking Event Address"
>From the POPs:
Breaking-Event-Address Register
When the PER-3 facility is installed, each CPU has a 64-bit register called
the breaking-event-address register. Each time execution of an instruction
other than TRANSACTION ABORT replaces the instruction address in the PSW by
any means other than sequential instruction execution, the instruction
address used to fetch that instruction is placed in the
breaking-event-address register.

This is the last address that caused a branch that caused the 0C1.

Mike Stayton
z/OS Communications Server
m...@us.ibm.com
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