What was found
ON GEAR RETRACTION, NOTICED A LOUD BANGING NOISE COMING FROM NOSE GEAR WELL. CONTINUED FLIGHT. AN EMERGENCY WAS DECLARED AND ACFT LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. PERFORMED GENERAL VISUAL INSPECTION OF GEAR. ACCOMPLISHED CHECK OF GEAR WOW PROXIMITY SWITCHES, NLG DOOR SEQUENCE SWITCH, UPLOCK SWITCHES, AND DOWNLOCK HARNESSES IAW MM 32-63-05. RT MLG UPLOCK "B" SHOWED FAULTY . WHEN RT UPLOCK BOX HOOK IS TRIPPED, "B" SENSOR NEVER SHOWS TARGET NEAR. SWAPPED HARNESSES "A" TO "B" AND VERIFIED SENSOR IS WORKING. PROBLEM IS HARNESS. R & R THE RT MLG UPLOCK BOX IAW AMM 32-33-10. PROXIMITY SENSOR, OPS & LEAK CHECKED GOOD. ACFT RETURNED TO SERVICE.