Upgrading Secondary Site Servers to SCCM 2012 SP2 or SCCM 2012 R2 SP1

Hello all,   I was working with one of my customers this week to upgrade their environment to SCCM 2012 R2 SP1.  The environment we were working in is relatively simple; single site primary with 3 child secondary sites.  Primary site server upgrade went fine.  And then we turned to the secondary site upgrades.  I…