The most common type of things that can cause a fuel jettison and return to origin are:
Engine failure
Pressurization problem
Landing gear problem (won't retract -or- gear retracts but gear door stays open)
Severely sick/injured passenger or crewmember
They mentioned a technical issue, so likely one of the first 3. I'd say it's not that important to find the granular details, but as posters upthread said, you could check it on the internet at the linked site after a week or so there will probably be a small report about it to satisfy your curiosity.