What was found
ON SHORT AND FINAL APPROACH INTO EWR EN ROUTE FROM PHX RECEIVED LANDING GEAR CONTROL AND INTERFACE UNIT (LGCIU) FAULT. EXECUTED MISSED APPROACH AND DECLARED EMERGENCY ON SECOND APPROACH. CONTRACT MAINTENANCE PERFORMED A LANDING GEAR BITE TEST IAW AMM 32-69-00, PG. 501, NO. 2 LGCIU TESTED GOOD, NO DEFECTS NOTED.