What was found
DURING DESCENT, HAD TWO QUICK INTERMITTENT ILLUMINATION OF THE DRIVE LIGHT ON THE NR 1 GENERATOR. AT TOUCHDOWN, WHILE EXTENDING THE THRUST REVERSERS, SOURCE OFF AND GEN OFF BUSS ILLUMINATED FOR THE NR 1 ENGINE. NR 1 ENGINE GENERATOR WAS INOPERATIVE. ACFT GROUNDED. SERVICED IDG AS REQUIRED IAW AMM 12-13-21. CONNECTED THE IDG. RAN ENGINE. INSPECTED IDG, FUEL TO OIL COOLER, OIL TO AIR COOLER, AND IDG DRAIN WITH NO LEAKS DETECTED. DRIVE LIGHT EXTINGUISHED AND GEN 1 DISPLAYED PROPER VOLTAGE AND FREQUENCY WHILE SUCCESSFULLY POWERING AIRCRAFT IAW AMM 24-11-00-700-802.