What was found
WHILE LANDING AT KPHL, THE NOSE LANDING LIGHT DID NOT ILLUMINATE AND A GO-AROUND WAS INITIATED. AFTER COMPLETION OF THE QRH, A LOW FLY-BY OVER THE RUNWAY WAS CONDUCTED AND THE CONTROL TOWER INDICATED THAT THE LANDING GEAR APPEARED TO BE IN THE DOWN POSITION. A NORMAL LANDING WAS MADE WITH NO FURTHER ACTION. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT AND UPON ARRIVAL THE CREW SAID THEY HAD TOUCHED THE ANNUNCIATOR AND IT BEGAN TO INDICATE BUT PRIOR TO THAT THE ANNUNCIATOR WOULD NOT TEST.