Despite last week's rebound from 1.3832, euro's subsequent selloff from 1.4074 suggests correction has ended on Friday and a firm break of 1.3878 would signal recent decline from 1.4202 has resumed, bring re-test of aforesaid support.  
Above 1.4040/50 would prolong choppy trading and yield another corrective rise to 1.4074 but latter resistance should limit upside and yield retreat later this week.