As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PACK LEFT EICAS MESSAGE PACK ACM (AIRCYCLE MACHINE) LEFT STATUS MESSAGE ON, WITH BURNING ELECTRICAL ODOR IN COCKPIT AND CABIN. REMOVED AND REPLACED LEFT HAND AIRCYCLE MACHINE. OPERTIONAL AND LEAK CHECK GOOD. PER B787 AMM 21-52-02.