Upgraded production region to CICS 5.5 and after a few hours of running started to experience several s0c4s.
SVCDUMP shows the abend occurs at CAIWCEPT+0128 IN CSA.
Release : 3.1
Component : CA-Opera for OS/390
New test fix provided (currently referred to as OperaCICS55.bbb)
Official APAR will be published in next few months