What was found
CREW REPORTED, THUMPING NOISE HEARD ON DESCENT AND APPROACH. ALMOST SEEMS THAT NOSE GEAR DOOR WAS CYCLING. MAINTENANCE TROUBLESHOT AND FOUND A LEAKING ACTUATOR AT NOSE LANDING GEAR DOOR NR 2. REMOVED AND REPLACED NOSE LANDING GEAR DOOR ACTUATOR IAW EMB145 AMM 32-33-03, OPS CHECKED GOOD. ALSO, FOUND CORROSION ON THE NOSE LANDING GEAR WOW PROXIMITY SWITCH. REMOVED AND REPLACED NOSE LANDING GEAR PROXIMITY SWITCH (PART NUMBER: 80-057-01 SERIAL NUMBER: 1374) IAW EMB145 AMM 32-63-02, OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.