What was found
NOSE DOOR AMBER LIGHT REMAINED LLUMINATED AFTER EXTENDING GEAR ON APPROACH. ALT GEAR EXTENSION WAS NOT PERFORMED IAW EMERGENCY CHECKLIST. NO EXCEEDENCES NOTED. GEAR SHOWED 3 GREEN AT ALL TIMES. ABORTED APPROACH AND WENT AROUND. LANDING UNEVENTFUL. NORMAL TAXI TO THE GATE. FERRIED TO FOR REPAIRS. PSEU NOTED "PSEU CHANNEL B FAIL CHANNEL INOP" AND" NGLK2 FAULT UNREASONABLE FAR" UNDER CURRENT FAULTS WITH DASHES INDICATION FOR NG LK2. R & R NG LK2 NLG ALTERNATE- LOCK PROXIMITY SENSOR HARNESS IAW AMM TASK 32-21-11-000-803 AND TASK 32-21-11-400-803. BOTH FAULTS WENT AWAY. PERFORMED OPS TEST OF THE LANDING GEAR EXTENSION AND RETRACTION. OPS TEST GOOD NO DEFECTS NOTED. RETURNED TO SERVICE.