As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A DURING SHUTDOWN ON ENG 2 & 3 DURING TAXI IN BTB NR 2 OPENED. WHEN CLOSURE ATTEMPTED THE KW OUTPUT ON GEN 4 SPIKED TO 60+ KW AND BTB REOPENED. ALSO SMELLED SLIGHT ODOR OF ELECTRICAL SMELL/BURN. REMOVED AND REPLACED NR 2 GCU.