What was found
ON DOWNWIND AT 210 KNOTS SELECTED FLAPS 1 AND GOT TRAILING EDGE FLAPS LIGHT & EICAS. RAN QRH, USED ALTERNATE FLAPS/SLATS & LANDED UNEVENTFULLY WITH FLAPS 20. EMERGENCY DECLARED. EMERGENCY DECLARED. ACCOMPLISHED FLAP/SLAT ELECTRONIC UNIT BITE PROCEDURES PER FIM 27-51 FT 805 AND AMM 27-51-01-2, NO FAULTS NOTED. FOUND LEFT WING INBOUND DRIVE TRANSMISSION OVERLOAD INDICATOR POPPED. RESET INDICATOR. INSPECTED REMAINING FLAP DRIVE TRANSMISSIONS ON LT AND RT WINGS, NO FAULTS NOTED. GREASED LT WING INBOUND DRIVE TRANSMISSION PER AMM 12-21-09-3. CHECKED OIL QTY ON ALL DRIVE TRANSMISSIONS NO FAULTS NOTED. RAN LT ENGINE PER JRH CH 6, OPERATED FLAPS AND SLATS FULL TRAVEL, NO FAULTS NOTED.