As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK INFLIGHT T766/31DEC DFW TO LGA - DURING APPROACH TO LGA FLAPS WOULD NOT EXTEND PROPERLY. LANDED JFK WITHOUT INCIDENT. FOUND NUMBER SIX SKEW SENSOR OUT OF TOLERANCE. REPLACED NUMBER SIX SKEW SENSOR. SYSTEM GROUND CHECKED NORMAL OPERATION.