What was found
SEA- WHEN APPLYING TAKEOFF POWER, MASTER CAUTION ILLUMINATED WITH NR 2 AC GEN CAUTION LIGHT, ABORTED TAKEOFF BELOW 40 KTS. RETURNED TO GATE. FERRIED ACFT TO PDX FOR REPAIRS. PERFORMED WIRE CHECKS FROM NR 2 AC GEN (P1) (P2) TO NR 2 GCU (P15), AND GCU (P15) TO NR 2 AC CONTACTOR BOX (P1), NO DEFECTS NOTED. RESEARCHED HISTORY OF GEN AND FOUND PREVIOUS HISTORY WITH GEN CAUTION LIGHT, REMOVED AND REPLACED NR 2 AC GEN IAW AMM 24-21-01-000-801, 24-21-01-400-801, OP CHECK GOOD. RETURNED TO SERVICE.