This techdoc gives steps on how to download CA 2E 8.7.3
Release : 8.7.3
Follow these steps
1. login to https://support.broadcom.com/
2. from left panel choose My Downloads and then double click on 2E
3. choose "Solutions" instead of the default "Products"
4. choose CA 2E 400 Toolkit OS/400 RISC then 8.7
5. then use either http or ftp to download "CA 2E R8.7.3 SOLUTION"