As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT TRANSFER BUSS OFF LIGHT ILLUMINATED AND NR 1 ENGINE DRIVEN GENERATOR DROPPED OFF BUSS. COMPLIED WITH QRH PROCEDURE AND COMPLETED FLIGHT WITH APU POWERING LEFT BUSSES. ACFT GROUNDED. PERFORMED FIM 24-21, TASK 818. FOUND OPEN BETWEEN PINS 6-7, AND 7-1 ON IDG RECEPTACLE DP1205. REMOVED AND REPLACED THE NR 1 IDG ASSY IAW AMM 24-11-11. LEAK CHECKED GOOD, OPS CHECKED GOOD. NO FURTHER DEFECTS NOTED.