What was found
MKE-BNA - FLT 2056 - DURING FLIGHT, THE CAPTAIN NOTED THE NR 2 INVERTER FAIL MESSAGE FOLLOWED BY SEVERAL AC BUSS FAILURES. THE PILOT CONSULTED MAINTENANCE. MAINTENANCE INSTRUCTED THE PILOT TO SHUT THE NR 2 INVERTER OFF AND CONTINUE WITH THE FLIGHT. THE PILOT MADE AN AIR-TURN-BACK TO MKE. UPON ARRIVAL IN MKE MAINTENANCE MEL'D THE NR 2 INVERTER ALLOWING THE A/C TO PROCEED WITH THE FIGHT. MAINTENANCE SWAPPED THEINVERTERS FOR TROUBLE SHOOTING BUT COULD NOT DUPLICATE THE DISCREPANCY. THE NR 1 INVERTER FAILED AND WAS MEL'D UNTIL LATER 12/22/2003 WHEN IT WAS REPLACED. MAINTENANCE RETURNED THE A/C TO SERVICE WITH NO FURTHER DEFECTS. (M)