As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AIR INTERRUPT, EMERGENCY DECLARED, LANDING UNEVENTFUL. CREW WAS INFORMED BY ACFT NEXT IN LINE THAT ON TAKEOFF THEY OBSERVED SPARKS COMING FROM THE RT MLG. MAINTENANCE FOUND THE NR 3 BRAKE DRAGGING. R & R BRAKE IAW AMM 32-41-41. ACCOMPLISHED HIGH SPEED TAXI WITH NO DEFECTS NOTED.