What was found
CREW REPORTED- EMERGENCY DECLARED ON APPROACH FOR ON DEPARTURE FROM SCF, FLAP LOW SPEED ADVISORY DISPLAYED ON EICAS, AND FLAPS FULLY RETRACTED. ON APPROACH TO LAS, FLAPS DID NOT EXTEND, AND FLAP FAIL CAUTION DISPLAYED ON EICAS. LANDED ZERO FLAPS ON 26R, NORMAL BRAKING SPEEDS, NO HOT BRAKES, NO OTHER CONCERNS. CORR ACTION- REMOVED AND REPLACED FLAP ELECTRONIC CONTROL UNIT. OPS CHECK GOOD PN INSTALLED: 363100-1013. PN REMOVED: 363100-1011. SN INSTALLED: 5217. SN REMOVED: 5290.