What was found
FLIGHT HAD EICAS ERROR/GROUND DISAGREEMENT LIGHT ILLUMINATE. EXECUTED GO-AROUND. FLAPS THEN LOCKED-OUT AT 22 DEGREES. EMERGENCY DECLARED. FLIGHT LANDED WITHOUT INCIDENT. *S/D* CAUSE: FAILURE PROTECTION SHUTDOWN OF T/E FLAPS WAS TRIGGERED BY THE FLAP/SLAT ELECTRONIC UNIT (FSEU) SENSING A TRAILING EDGE FLAP DISAGREE CONDITION. MAINTENANCE CLEARED ALL EXISTING FAULTS ON THE FSEU, VERIFIED PROPER OPERATION OF T/E FLAP POSITION TRANSMITTERS AND FLAP ROTARY ACTUATORS PER MM. FINAL OPERATIONAL CHECKS PER MM FOUND ALL OK.