What was found
OPERATING UNDER MEL 49-33-12 (NO APU GEN AVAILABLE) DURING TAKEOFF AT V1 FO PFD FLICKERED, ALT FLAT. AT APPROXIMATELY 1000 AGL GEN 2 FAULT AND AC BUS 2 FAIL ON ECAM AND OVERHEAD PANEL. GEN 2 DID NOT RESET AND COULD NOT POWER AC BUS 2. ATB TO KDEN. DURING ATB APPROXIMATELY 10 MINUTES AFTER FAILURE GEN 2 AND AC BUS 2 WAS POWERED AGAIN. NORMAL APPROACH AND LANDING KDEN. REMOVED AND REPLACED NR 2 GCU IAW AMM 24-22-12-04 MFG P/N 740120B S/N 1894. INSTALLED GCU MPN 764067A S/N A108. RAN BOTH ENGINES IAW JRH TRANSFERRED POWER BETWEEN NR 1 GEN AND NR 2 GEN SEVERAL TIMES NO FAULTS NOTED. CHECKED FOR WATER INTRUSION INTO E&E COMPT NO WATER FOUND.