SVC 001
SVC 001 is issued by the WAIT/WAITR/PRTOV macro. This macro obtains a LOCAL lock and calls either module IEAVEWAT (for WAIT/WAITR) or module IGG019CL for PRTOV.
Hints
Refer to the attribution reports to determine the location from where this SVC is issued, and see if you can determine the reason for the wait.
Reference Sources
IBM z/OS MVS Diagnosis Reference