What was found
NOSE LANDING GEAR INDICATOR INOPERATIVE DURING APPROACH & LANDING. AFTER 2ND CYCLE OF LG LIGHT WITH 1/2 ILLUMINATION OCCURRED. EMER DECLARED AT DESTINATION STATION. NO ISSUES WITH LANDING. GND PERSONNEL ADVISED OF ALL THREE LG DOWN INDICATION. NO EICAS MX MSGS WERE NOTED. PERFORMED PSEU TEST IAW MM 32-09-04. NO INFLIGHT MSGS PRESENT. FOUND DIODE CARD IN NLG POSITION INDICATOR LOOSE. RESEATED INTO SOCKET & RELAMPED IAW MM 33-13-00. LG POSITION INDICATION SYS TESTED SATISFACTORY IAW AMM 32-61-00. ACFT RELEASED TO SERVICE.