What was found
AT 50 FT AGL, GEAR HORN SOUNDED WITH AMBER NOSE GEAR BOX ON EICAS, NO GEAR DISAGREE MSG. ACFT TOUCHED DOWN ON ALL 3 GEARS, INITIATED GO AROUND, WHEN THROTTLES ADVANCED, HORN CEASED & NLG BOX RETURNED TO GREEN, SELECTED GEAR UP FOR GO-AROUND. ALL INDICATIONS NORMAL & ALL NORMAL WHEN GEAR SELECTED DOWN FOR NORMAL LANDING.