What was found
FLIGHT 7771, ENROUTE BZN - GTF/AIR TURNBACK DISCREPANCY: AFTER TAKEOFF, THE #2 DC GEN FAULTED WITH NO BUS TIE AFTER TURNING OFF. CREW PERFORMED AN UNSUCCESSFUL RESET, FOLLOWED THE QRH AND RETURNED TO BZN. AN EMERGENCY WAS DECLARED AND AN ELECTRIC SMOKE SMELL WAS DETECTED IN THE COCKPIT AFTER LANDING. CORRECTIVE ACTION: MAINTENANCE TROUBLESHOT AND REPLACED THE 30PU CONTACTOR ALONG WITH THE #2 GCU. OPS CHECKS GOOD. GCU PN# 102-003-11 SN# 5100-19