What was found
ON TAXI, NOTED NR 2 & 4 GENERATOR SHOWED NO KW'S AND NO VOLTAGE FREQUENCY. ALSO, NR 3 CSD LIGHT ON FLIGHT ENGINEER'S PANEL - READ ANNUNCIATOR. SERVICED NR 2 & 4 CSD'S. RAN ENGINES AND DISCONNECTED NR 2 & 4 CSD'S. RECONNECTED NR 2 & 4 CSD'S. RE-RACKED GCU AND BPCU. CHECKED VOLTS AND OHMS ON CONNECTOR TO AC VOLTMETER PANEL, ALL CHECKS SATISFACTORY. DMI CLEARED.