From a school point of view, DS2 is doing well - working hard, joining things, volunteering to help.
At home he has recently become uncommunicative (unless sighs and grunts count as communication) and not very cooperative when asked to do something. This is very unlike him. 
He is socially a bit delayed, so it's hopefully just that he is just now hitting the adolescent / teenage developmental phase. I will keep an eye on it as we have a family history of mental health problems.