As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT - CREW REPORTED INTERMITTENT SLAT ASYMMETRY INDICATION ON FINAL APPROACH. LANDED BOS WITHOUT INCIDENT. FOUND PROXIMITY SENSOR ELECTRONIC UNIT FAULT ON CARD 13 AND FAULT ON FLAP HANDLE. ADJUSTED FLAP HANDLE AND REPLACED PROXIMITY SENSOR ELECTRONIC UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION.