As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TRANSIT CHECK, IT WAS DETECTED EICAS MESSAGE LIQUID COOLING 21-81013. MAINTENANCE PERSONNEL PERFORMED A REVIEW TO COOLING SYSTEM, DETECTING THE LEFT POWER ELECTRONICS COOLING (PECS) FAILED; SO THE LEFT POWER ELECTRONICS COOLING WAS REPLACED IAW AMM DMC-B787-A-21-81-18-00A-520A-A AND DMC-B787-A-21-81-18-00A-720A-A, TESTED CORRECT.