As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED THE NR 1B HYDRAULIC PUMP CIRCUIT BREAKER TRIPPED AND COULD NOT BE RESET UNTIL NR 2 GENERATOR WAS TURNED OFF. TROUBLESHOOTING REVEALED A LARGE VOLTAGE DROP ACROSS ONE PHASE OF THE GENERATOR LINE CONTACTOR. THE NR 2 GENERATOR LINE CONTACTOR WAS REPLACED AND PROBLEM WAS CURED. CLOSE INSPECTION OF THE CONTACTOR REVEALED THE A1 TERMINAL STUD NOT FULLY SEATED IN INSULATOR. SLIGHT PRESSURE LOOSENED IT FULLY FROM INSULATOR. UNIT WAS REPLACED.