What was found
DURING FLIGHT #3367, RH AC GEN FELL OFF LINE, CREW RESET THEN IT FELL OFF LINE SHORTLY AFTER. AIR RETURN TO MSP. MAINTENANCE CND, SWAPPED AC GCU'S SIDE TO SIDE PN 51634-002, SN/ON RH SIDE, 97005, SN/ON LH SIDE 96036. OPS CHECK GOOD. IAW SAAB AMM 24/21/10. INSPECTION OF RH AC GEN SHAFT SHEER SECTION AND CLAMP POSITION GOOD.