Ongoing talks with state and local officials and station members have prompted the Maine Public Broadcasting Network to delay the shutdown of two of its transmitters, set for Jan. 15, until Feb. 28. President Jim Dowe says the transmitters will continue operation as talks progress. The network has made staff cuts, salary reductions and other cutbacks in the wake of cuts in funding, including loss of a $400,000 federal rural development grant it has used for 14 years.