What was found
EMERGENCY DECLARED FOR TE FLAP DISAGREE. FLAP EXTENSION NORMAL TO 15 DEGREES. AT APPROX 175 KNOTS WE SELECTED FLAPS 20. THE FLAP INDICATOR MOVED TO APPROX 17 DEGREES AND STOPPED. TE FLAP DISAG EICAS MESSAGE WAS DISPLAYED. RAN QRH PROCEDURE AND LANDED WITH FLAPS 20. ***EMERGENCY DECLARED*** #4 FLAP TRANSMISSION OVERLOAD INDICATOR POPPED. RESET AND PLACED ON OIL PER FIM 27-51/808 AND TO RECHECKWITHIN 3 DAYS #4 FLAP DRIVE FOUND OVERLOAD BUTTON POPPED.