What was found
AFTER TAKEOFF GEAR UP & OFF NOSE GEAR RED LT ONLY. CHECKLIT RAN NOSE GEAR GREEN RETURN TO AIRPORT THREE FAULTS FOUND IN BITE TEST OF PSEU. ERROR MSG: NOSE LKD A FAULT (MESSAGE#32 - 61003), NOSE LKD B FAULT (MESSAGE# 32-61010), DO NOT DISPATCH (MESSAGE# 32-64004). PICS INCLUDED. CREW DEBRIEF. CREW REPORTS THEY NOTICED RED LIGHT ON NLG ONLY AF TER GEAR LEVER PLACED TO OFF AFTER TAKEOFF. ATTEMPTED TO CYCLE A ND GOT BOTH RED AND GREEN LIGHTS FOR NLG ONLY. ALSO NOTED THAT W HEN THE NLG EMERGENCY EXTENSION DOOR WAS PUSHED DOWN TO ENSURE I T WAS FLUSH, THE NLG DOORS CAME DOWN. CREW DROPPED GEARS AGAIN A ND GOT ALL GREEN DOWN LOCKED INDICATION AND RETURNED TO FIELD. A C WAS NOT OVERWEIGHT. BASED ON PSEU BITE CHECK FAULTS 32-61003 AND 32-61010, SEE FIM 32-61 TASK 804. POSSIBLE CAUSE PROX SENSOR S846 AND/OR S854. SEE IPC 32-61-41-01 ITEM #115. PN 1-899-29 M&E 29-2762-3-0093 OR PN 80-207-01 M&E 29-2788-3-0007. JACKED UP NOSE OF AIRCRAFT FOR GEAR SWING TO TROUBLESHOOT GEAR INDICATION PROBLEM. REF AMM 7-11-21 PERFORMED CLEANING AND VISUAL INSPECTION OF NOSE LANDING GEAR (NLG) LOCK SENSOR, S846 & (S854) AND ASSOCIATED WIRING NO DAMAGE FOUND. DURING GEAR SWING OF THE NLG FOUND THE INDICATION OF SENSOR S854 ON THE PSEU DID NOT CHANGE FROM NEAR WHEN EXTEMDED TO FAR WHEN RESTRACTED IT DID NOT CHANGE AT ALL DURING THE OPERATION OF THE NLG. S846 WAS OPERATING OK. USED THE DE-ACTUATOR TOOL TO TEST IF THE INDICATION OF THE S0854 SENSOR WOUOF NLG OPS CHECK NORMAL.