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From Dutch Harbor, "S-32" returned to San Diego. Overhaul followed her 11 November arrival; and, from 21–25 December, she tested newly installed equipment: a fathometer, radar, and keel-mounted sound gear. From 28 December 1942 to 26 January 1943, she provided services to the West Coast Sound School, and on 6 February, she headed north toward Dutch Harbor.