What was found
SEA FLIGHT NR 2070 WITH NR 1 FEATHERED AND NR 2 UNFEATHERED THE LEFT TRU CAUTION ILLUMINATED. WITH NR 2 FEATHERED AND NR 1 UNFEATHERED THE LIGHT WAS NOT ILLUMINATED. FOUND NO AC POWER ON LEFT BUSS WHILE NR 1 AC GENERATOR OFF LINE AND NR 2 GENERATOR ON LINE. REMOVED AND REPLACED NR 1 AC CROSS TIE CONTACTOR 24-21-K1. PERFORMED FUNCTION TEST OF THE AC GENERATOR SYSTEM IAW -8 Q200 AMM 24-21-00-720-801. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.