What was found
ON APPROACH, SELECTED FLAPS 1 TO FLAPS 5. RECEIVED TE FLAP ASYMMETRY EICAS MSG & TRAILING EDGE LIGHT. COMPLETED THE QRH, TE FLAP ASYMMETRY CHECK LIST & USED ALTERNATE FLAPS, SETTING 20 DEGREES FOR LANDING. 'EMERGENCY DECLARED. ALL SWITCHES BACK TO NORMAL. HYD ON FOR ALL 3 SYS, ADP ON FOR CENTER. FLAP/SLAT DOWN EACH POSITION, NO ANOMOLIES. HYD SYS ON, DOWN FLAPS EACH POSITIONS, NO ANOMOLIES. 5 TO 1 & 1 TO 5 AGAIN. COULD NOT DUPLICATE ON GROUND. CHECKED FSEU, FOUND NO FAULTS. BITE CHECKED NORMAL. FLAPS ALL THE WAY DOWN, CHECKED MECHANISMS FOR ANY OUT OF THE ORDINARY LEAKS, & DAMAGE, NONE NOTED. FAIRED COMING DOWN & FULLY UP & RETRACT. OPS CHECKED NORMAL IAW MM 27-51-00-2 AND 27-58-01. OK TO CONTINUE.