As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR CO3433 CREW REPORTED LEFT UNLOCK LIGHT ILLUMINATED WITH GEAR RETRACTED ON SYSTEM NR 2 (NO DOWNLOCK INDICATION WITH GEAR EXTENDED). MAINTENANCE REMOVED AND REPLACED LEFT DOWNLOCK PROXIMITY SWITCH IAW ATR42 MM 32-61-00. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.