What was found
AIRCRAFT ROUTED FROM BWI TO TPA DIVERTED INTO JAX. IN FLT FL350 SMOKE ENTERED COCKPIT IN VICINITY OF GCU NR 1 AND NR 1 GENERATOR DROPPED OFF LINE. PULLED NR 1 GCU CB AND SMOKE DISSIPATED. APU STARTED AND POWERED NR 1 GEN BUS NORMALLY. A/C DIVERTED WITH NO FUTHER PROBLEMS. MADE AN UNEVENTFUL LANDING. VERIFIED CSD OIL QTYS AND APU OIL QTY PLACARED NR 1 GENERATOR PER MEL. REMOVED AND REPLACED NR 1 GCU PER BOEING MM.