What was found
LANDING GEAR DISAGREE EICAS. NOSE GEAR DID NOT COME DOWN INITIAL LY DEBRIEFED CREW , PILOTS ADVISED ME ON APPROACH THAT AT 1600 FT CALLED FOR GEAR DOWN. THE MLG CAME DOWN & LOCKED ON , BUT THE NOSE GEAR DIDN'T . THEY DID A GO AROUND WENT AROUND AT 1000FT . THEN AT 2000 FT THERE WAS A MLG EICAS DISAGREE STATUS MESSAGE .THEY RETRACTED THE MLG AND NLG UP & LOCKED .THEN ATTEMPTED ANOTHER APPROACH AT 2500 FT TO BRING DOWN MLG AND NLG . THE MAIN GEAR & NOSE GEAR FINALLY CAME DOWN & LOCKED. AHM ALERT 32-3166-Y921 NOSE LANDING GEAR DOOR SLOW TO START DURING EXTENSION. FIM TASK TO FOLLOW 32-30-00-810-810. TECHS CYCLED GEAR DOOR OPEN/CLOSE SEVERAL TIMES AND NOTED THAT NOSE GEAR DOORS OPEN ABNORMALLY SLOW. REF FIM: 32-30 TASK 810. R & R NOSE LANDING GEAR SELECTOR VALVE. COMPLETED INSTALLATION UP TO INCLUDING STEP 3.F(15).