Welcome Back To The Gemba!
CHAPTER 1: LEAD FROM THE GROUND UP
Schedule regular visits at your teams in all workplaces and ask them about the main complaints from their internal and external customers, as well as the main difficulties they experience from using internal systems.
Listen for your teams' understanding of what end customers are really asking for ad look out for typical signs of "Big Company Disease":
Your challenge is to make a shortlist of issue to investigate more deeply by asking teams here and there to try something new.