What was found
ELEC GEN DRIVE L EICAS ADVISORY LEFT IDG FAULT (LOW INTERNAL OIL PRESSURE). REPLACED BOTH L&R GCU PER AMM 24-22-02-000-801. GCU POST INSTLATION TESTED. FOUND OK. RAN BOTH ENG. GEN OPS NORMAL. PARTS USED: 1211678,QTY :1 27-2421-9-0001,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1011963 SN OFF 1255 TT # 1211678 SN OFF 0123REPLACED LH IDG. RAN ENG. OPS CHKD OK. PARTS USED: 25-2411-9-0002,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1045547 SN OFF 0209