As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, AT FLAP RETRACTION LE SLAT DISAGREE MESSAGE ON EICAS ILLUMINATED AND SLAT/FLAP POSITION INDICATOR INDICATED SLATS NOT RETRACTED. RETURNED TO DEPARTURE STATION AND ACCOMPLISHED UNEVENTFUL LANDING. INVESTIGATION REVEALED BOTH FSEU''S FAULTED PDU SLAT XMITTER. RESET BOTH FSEU''S FLAPS/SLATS OPERATIONAL CHECK NORMAL. (M)