What was found
CLT - FL 2247 - EN ROUTE PIT TO MCO OVER CLT CLIMBING FROM FL 280 TO FL 310, CREW NOTICED THE NR 1 GENERATOR DRIVE OIL TEMP INDICATED HIGH IN THE 'IN' POSITION. FREQUENCY/VOLTS WERE NORMAL. AT FL 310, NR 1 GENERATOR DRIVE WENT OFF SCALE HIGH AND THE HIGH OIL TEMP LIGHT ILLUMINATED. CREW WAS UNABLE TO PUT THE NR 1 BUS ON LINE BECAUSE THE NR 2 BUS WAS BEING POWERED BY THE APU DUE TO THE NR 2 GENERATOR CSD BEING INOP AND ON MEL. FLIGHT DIVERTED TO CLT AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE FOUND THE NR 1 CSD OIL WAS OVERSERVICED BY 1.5 QTS. DRAINED OIL TO PROPER LEVEL AND RAN ENGINE. OPS CHECK GOOD. OIL LEVEL CHECKED GOOD AFTER ENGINE RUN. (M)