What was found
1 ENGINE DRIVE LIGHT ILLUMINATED. RAN CHECKLIST AND DISCONNECTED NR 1 DRIVE. ACFT GROUNDED. BITE CHECK OK, NO FUEL FOUND IN OIL. NO OIL IN SIGHT GLASS, EVIDENCE OF LEAKAGE FROM THE AIR/OIL COOLER IN THE C-DUCT, REF FIM 24-11, TSK 801, STEPS A-F. 4, A. REPLACED NR 1 IDG AND AIR/OIL COOLER. NO CONTAMINATION FOUND IN REMOVED IDG OIL FILTERS. 1 C/B PULLED/TAGGED AND REST REF MM 24-11-11, 3 A - 3G, 12, MM 24-11-21, 3 A-3 G 3, MM 24-11-11-090-801C3. IDG OIL SYSTEM STATIC LEAK CHECK OK, REF MM 24-11-00-700-801. NR 1 IDG AND AIR/OIL COOLER LEAK AND OPS CK GOOD, REF MM24-11-11, MM24-11-21, AND MM24-11-00.