As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW RECEIVED A FLAP LOW SPEED WARNING ON EICAS AND A COMPARATOR WARNING ON THE EFIS CAUSED BY A 30 KIAS DISCREPANCY BETWEEN LEFT AND RIGHT AIRSPEED INDICATIONS. CREW DECLARED AN EMERGENCY, RETURNED TO DEPARTURE AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPORTED FINDING THE PITOT SYSTEM DRAIN LINE HOLES PLUGGED WITH INSECT NEST. THE TUBE WAS CLEANED IN ACCORDANCE WITH AMM 34-13-00.