As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN TO BOS FA'S IN AFT OF THE AIRCRAFT NOTICED A MILDEW/DIRTY SOCK ODOR THAT BEGAN ON FINAL JUST BEFORE GEAR EXTENTION. NO PAX NOTICED IT AND THE SMELL DISIPATED AFTER BLOCK IN. APU BLEED WAS NOT USED. REPLACED NR 2 ENGINE. (LP 8537300 - AIRCRAFT WAS GROUNDED)