As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 2160 - ODOR OF DIRTY SOCKS OR SLIGHT BURNING, WITH APU SUPPLYING AIR TO PACK. REMOVED AND REPLACED RECIRCULATION FILTER AND NO ODOR NOTED AT THIS TIME. FOUND HYD LEAK IN LT WHEEL WELL AND REPAIRED LEAK. APU REMAINS IN MEL. WILL CONTINUE TO MONITOR WHILE INVESTIGATION CONTINUES FOR ROOT CAUSE. RAN APU EXTENSIVELY AND WASHED APU. NO ODORS WERE DETECTED. NO POST EVENTS REPORTED RELATED TO THIS EVENT.