As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO4143 CREW REPORTED LANDING GEAR INDICATION DISAGREEMENT. AFTER TROUBLESHOOTING PROBLEM, MAINTENANCE CLEANED LANDING GEAR PROXIMITY SWITCHES IAW EMB145 MM CHAPTER 32-61-00. AIRCRAFT TEST FLOWN SATISFACTORY AND RETURNED TO SERVICE.