You can easily collect the TXSeries MustGather documents for hang condition of a region and U-abends through cicsservice tool.
The following command can be run when the region is non-responsive state:
/usr/lpp/cics/utils/cicsservice/cicsservice -r niktest -D /tmp -o HANG
The command will collect all the documents required to be collected for a region in hang state for further investigation. Stop and restart the region after the command completes.