As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING APPROACH, THE FLAPS DID NOT EXTEND PAST 5; AIRCRAFT EMERGENCY LANDED SAFELY AT BOS. REMOVE AND REPLACED LEFT FLAP POSITION TRANSMITTER (AALA202601126925), PER J/C 08C00027012. ALSO, REMOVE AND REPLACED TRAILING EDGE BYPASS VALVE (AALA202601128379), PER AMM 27-51-02. OPERATIONAL TESTS GOOD.