What was found
ON TAXI OUT EXPERIENCE EICAS MSG ELEC ISLN 3. PERFORMED QRH PROCEDURE, PROBLEM CLEARED THEN ON TAKEOFF EXPERIENCED PROBLEM AGAIN, DID LOW SPEED REJECTED TAKEOFF, ITEM TRANSFERRED TO MDDR 57619 IAW MEL 24-11-01A. NR 3 IDG DISCONNECTED NORM IAW DDG PROCEDURES PLACARDS INSTALLED DISPATCH NOTIFIED.