What was found
NR 2 GENERATOR FAULTED ON INTIAL TAKEOFF ROLL. REJECTED TAKEOFF AND COMPLIED WITH QRH PROCEDURES. ON ATTEMPTED GEN RESET, GEN AND ELEC LIGHTS FLICKERED RAPIDLY, WOULD NOT RESET. RETURNED TO GATE. REMOVED AND REPLACED NR 2 GCU IAW AMM 24-22-12-04-0. RAN NR 2 ENGINE IAW JRH, FUNCTION CHECKED GOOD.