As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT TOOKOFF WITH APU OFF. APPROXIMATELY 40NM OUT, THE NR 2 GENERATOR WENT OF LINE AND SHOWED NR 2 GEN CAUTION LIGHT. DURING THE HANDLING OF THE QRH PROCEDURE, NR 1 GENERATOR WENT OFF LINE. DUE TO TOTAL AC-POWER LOSS THE ADG DEPLOYED AUTOMATICALLY. NR 1 GENERATOR WAS RECOVERED BY PERFORMING RESET GENERATOR OFF/RESET SWITCH, ACFT RETURNED TO ORIGIN.