SVC 107
SVC 107 is a Type 6 SVC issued by the MODESET macro. This macro does not get a lock and calls program IGC107 in load module IEAVMODE.
It alters selective fields of the PSW. It can also change the status of programs between supervisor state and problem program state.
Reference Sources
IBM z/OS MVS Diagnosis Reference
IBM z/OS MVS Programming Authorized Assembler Services Guide
IBM z/OS MVS Programming Authorized Assembler Services Reference Vol. 3