Does your system product code include/use the following?
ACFVALD: Definition - This is the native ACF2 Supervisor Call (SVC)
interface for signon support and would be in use if a product
or application was interfacing with ACF2 prior to IBM System
Authorization Facility (SAF) support.
Release : 14.0
ACFVALD is not used by any component of OPS/MVS.