What was found
SEA FLIGHT NR 2396: NR 2 AC GEN LIGHT ILLUMINATED. AIRCRAFT RETURNED TO FIELD. MAINTENANCE REMOVED AND REPLACED THE AC GENERATOR (PN 28B555-1, S/N 071C0358) IAW Q400 AMM 24-21-01, PAGES 401-410. NO HELP NOTED. REMOVED AND REPLACED AC GENERATOR GCU IAW Q400 AMM PAGES 401-406. PERFORMED OPS TEST OF THE AC VARIABLE FREQUENCY GENERATION SYSTEM IAW Q400 AMM 24-21-00, PAGES 501-502. OPS CHECK GOOD. REPLACEMENT OF AC GEN WAS IAW MTX TASK CARD NR 6242101. AIRCRAFT WAS RETURNED TO SERVICE.