As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: "RT GEN DRIVE" EICAS MESSAGE (AIR RETURN). CORRECTIVE ACTION: FOUND "RT IDG LOW OIL PRESS" ON BPCU. EXAMINED DPI, NOT EXTENDED. RE-CONNECTED IDG AND PERFORMED IDG OIL SERVICING, PER AMM 12-13-03, AND FOUND OIL LEAK FROM B-NUTS ON IDG. TIGHTENED B-NUTS AND RAN ENGINE AND OPERATIONS CHECK OK, IAW AMM 24-11-00.