The problem occurs when running on z9 or older processors.
The S0C1 occurs on a TRTE instruction (Translate and Test Extended) in DBMPLPR because the hardware does not understand this instruction.
TRTE is only available when the parsing-enhancement facility is installed. This facility is not available on z9 processors.
It was implemented starting with z10 processors.
Upgrade to Datacom/AD 14.0 instead of 15.0 as AD 14.0 does not use that instruction.