What was found
CLT FLT 1054 - AIRCRAFT DEPARTED WITH THE LEFT GENERATOR ON MEL AND THE APU GENERATOR SUPPLYING LEFT AC BUSS. DURING APPROACH INTO CLT, THE AIRCRAFT LOST THE LEFT AC BUSS (DURING ILS COUPLE UP) AND THE APU WOULD NOT RESTORE LEFT BUSS POWER. FLIGHT LANDED WITHOUT FURTHER INCIDENT. AFTER SEVERAL MINUTES ON THE GROUND, THE LEFT AC BUSS POWER RESTORED ON ITS OWN. CREW ALSO FOUND TR1 CIRCUIT BREAKER TRIPPED. MAINTENANCE REMOVED AND REPLACED THE LEFT SIDE GENERATOR BUSS TIE BREAKER PER MM 24-21-41. OPERATIONAL CHECK GOOD. ALSO, REMOVED AND REPLACED NR 1 GENERATOR AND CSD PER MM 24-11-11-04 AND 24-21-11-04. OPERATIONAL CHECK GOOD. REMOVED MEL.