What was found
LT GEN TRIPPED OFF LINE ON T/O FROM ORF. QRH PROCEDURE WAS RUN AND GEN RESET NORM. APPROX 3 MINS LATER CREW WAS NOTIFIED OF LIGHT SMOKE IN FWD PART OF CABIN. THE A/C RETURNED TO ORF. MX FOUND NR 1 TRANSFORMER RECTIFIER C/B POPPED AND NR 1 ENG FIREWALL DISCONNECT PHASE (B) FOR GEN FEEDER BURNT. TRANSFORMER RECTIFIER AND BATTERY/CHARGER WERE REPLACED IAW MM 24-21-31 AND 24-31-21. NR 1 ENG GEN HARNESS WAS R/R'D. NR 1 GEN FEEDER CABLE D3024 RECEPTACLE WAS ALSO REPLACED. RETERMINATED PYLON HARNESS PER BOEING. NR 1 ENG WAS RUN AND GEN FREQ WAS ADJUSTED IAW MM 24-11-11. OPS OF NR 1 GEN WAS GOOD. TEST FLT EVALUATION WAS PERFORMED AND ALL OPS CHECKED GOOD WITH NO DEFECTS NOTED.