As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE NR 1 WASH NOTED FAN BOOSTER ACOUSTICAL PANEL BETWEN POSITION 4 O'CLOCK MISSING. CONFIRMED MISSING PANEL LINER ACOUSTIC . REMOVED AND INSTALLED FAN BOOSTER ACOUSTIC PANEL REF AMM DMC-B787-A-G72-22-04-00A-520A-A AND DMC-B787-A-G72-22-04-00A-720A-A, ACFT OK TO CONTINUE.