How to do some changes in each member of PDS?

For example we have some PDS with members like this:

And we need to change CLASS=A to CLASS=E in each of them.

From ISPF Primary Option Menu select FMN (File manager) and then 3.6

Specify PDS and members:

In the command line type:

c 'CLASS=A' 'CLASS=E'

Press Enter. You will see all changes:

Press F3

Press Enter to complete

The result: