As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: STRIP OF MATERIAL LOOSE AND FLAPPING AROUND AT TOP OF L1 WINDSHIELD APPROX 12 INCHES OUTBOARD OF THE TIP OF THE WINDSHIELD WIPER BLADE NO ARCING NOTED STRIP OF MATERIAL DEPARTED AIRCRAFT. MAINTENANCE REPAIRED HUMP SEAL PER B787-A-56-11-00-03A-663A-A.