As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GIG - FLT 800 EN ROUTE CREW RECEIVED EICAS MESSAGE FOR L/E SLAT ASYMMETRY. THE FLAPS ONLY EXTENDED 1/2 DEGREE. THE FLIGHT DECLARED AN EMERGENCY AND PERFORMED A FLAPS UP LANDING. THE AIRCRAFT TAXIED TO THE GATE WITHOUT FURTHER INCIDENT. FOUND SLAT SENSOR TO TARGET GAPS OUT OF LIMITS.