---------------------------<snip>-------------------

AMASPZAP opens the SYSLIB dataset with a DCB, not an ACB, so it can't
open a VSAM dataset.


z/OS MVS Diagnosis:  Tools and Service Aids disagrees:

In addition, SPZAP can be used to inspect and modify data other than
executable programs. Examples of such types of data are:

..
o A VSAM sequential or indexed data set.


If I remember correctly, authorized programs (APF, system key, or supervisor state) can use a DCB to OPEN a VSAM data set.

------------------------------<unsnip>-------------------------
As I am learning, to my chagrin. Open mouth, insert foot..............  <G>

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