What was found
A/C N765 EN ROUTE RMS TO FRU ADVISED MCC THE LEFT GENERATOR DRIVE LIGHT CAME ON. FLT CREW PERFORMED QRH PROCEDURES GENERATOR DRIVE LIGHT STAYED ON. NOTE: THE APU WAS INOP. THE A/C DIVERTED TO LEJ. A SOFT OVERWEIGHT LANDING WAS ACCOMPLISHED OVERWEIGHT LANDING INSP PER M/M TASK 05-51-35-212-001 PHASE 1 OPTION ALPHA NO DEFECTS NOTED. APU INOP ECU FAULT. REPLACED APU ECU P/N 2117392-20 S/N 88-B0015 PER M/M 49-61-05-404-008 AND TASK 49-61-65/201 OPS CHECKED OK CLEARED CI 49-03. IDG VALVE EICAS MSG DISPLAYED. OPENED CI 75-01 MEL 75-21-1 OPENED C/B M4 LT ENG IDG VALVE AND COLLARDED. PERFORMED MAINT PROCEDURE LOCKED IDG VALVE IN OPEN POSITION STOWED CONNECTOR. NR 1 ENGINE GENERATOR PER MEL 24-00-1 CAT B (M)(O) EXCEPT FOR ER BEYOND 120 MINUTES - SDR REMAINS OPEN.