As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE SMELL COMING FROM E&E COMPARTMENT. FOUND LEFT ENGINE GCU WITH STRONG BURNT SMELL AND NO GENERATOR PRESSURE LIGHT IN COCKPIT. SWAPPED LEFT GCP AND APU GCP AS TROUBLESHOOTING. NO SMOKE PRESENT. APU ELECTRICAL FUNCTION INOPERATIVE. REMOVED AND REPLACED APU GCU IAW B767 MM 24-22-02. OPS CHECKED GOOD.