What was found
ELEC GEN OFF RT EICAS ADVISORY RT GENERATOR CONTROL BREAKER (GCB) OPEN OR GENERATOR CONTROL SWITCH OFF, & ENG NOT SHUTDOWN. RT GCU REPLACED ON 11/26 & RT IDG REPLACED ON 11/27 IAW PILOTS ENG 2 IDG TRIPPED AT GATE IN IAD. RESET IAW MANUAL & CONTINUED UNTIL RT IDG TRIPPED & AC DIVERTED. AC HAS KNOWN HISTORY. IDG OILS READING NORMAL ON INBOUND. DUE TO RECENT REPETITIVE HISTORY OF ELEC GEN OFF RT BEING REPORTED WITH ONLY MMSG 24-31762 BEING REPORTED ON DIVERSION INTO SFO. REPLACED RT GENERATOR CONTROL UNIT IAW AMM 24-22-02-400-801 A-E. SOFTWARE CHECK AND TEST NOT ACCOMPLISHED. REPLACED RT GCB. ACCOMPLISHED ENG RUN FOR NR 2 ENG GCU & CONTACTOR REPLACEMENT. GCU REPLACEMENT IAW 24-22-02-400-801. RAN ENGINE FOR 10 MIN WITH A LOAD BETWEEN 70-80% AND CYCLED BETWEEN GEN POWER WITH NO ISSUES.