Brian Carovillano, day supervisor for The Associated Press in Boston, has replaced Michael Warren as the wire service’s news editor for Northern California, based in San Francisco. Warren was named deputy Latin America editor for English services. Carovillano, 32, served as AP’s lead reporter for the federal corruption trial of longtime Mayor Vincent “Buddy” Cianci and was involved in coverage of the West Warwick, R.I., nightclub fire that killed 100 people. Carovillano’s appointment was announced Jan. 23 by John Raess, chief of bureau for Northern California, northern Nevada and Hawaii.