As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT 4164 - CREW REPORTED LANDING GEAR WOULD NOT RETRACT DURING GO AROUND. RETURNED TO THE FIELD AND LANDED UNEVENTFULLY. MAINTENANCE FOUND ICE ON ALL PROXIMITY SWITCHES. CLEANED SWITCHES AND OPERATIONALLY CHECKED GOOD ON TEST FLIGHT. (M)