AP, BEIRUT, Lebanon – Buoyed by their success in forcing Syria to withdraw some troops, elements of the Lebanese opposition have called for the return of two Christian leaders who played a major role in the country’s bloody civil war.Nematallah Abi Nasr, a Christian legislator, said Monday that he and some colleagues were working to secure the release from prison of Samir Geagea, who led the powerful Lebanese Forces militia during the 1975-90 war, and the return from exile in France of Gen. Michel Aoun, the former Lebanese army commander.Abi Nasr and five other opposition legislators – including a Sunni Muslim, a Shiite Muslim and a Druse – have signed a petition for a bill that would allow Geagea to receive amnesty.