As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS AFTER TAKE OFF DURING FLAP RETRACTION LE SLAT ASM EICAS MSG LIGHT ILLUMINATED. FLAPS INDICATED BETWEEN 1 AND UP. EMERGENCY DECLARED. MAINTENANCE REPORTS SENSOR (S304) GAP IS OUT OF LIMITS AT FULL RETRACT. CURRENTLY READING .105, MUST READ .115-.145 IAW AMM 27-88-01-902-001. ADJUSTED TARGET SENSOR GAP TO .130 ON #8 SLAT INBD SENSOR IAW AMM 27-88-01-902-001. SLAT SENSOR INSTALLATION CHECK FOR S304 IS GOOD.