As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR LOG SQUAWK ON LANDING CABIN FILLED WITH SMOKE, GRAY IN COLOR SMELLED LIKE BURNED RUBBER. INSPECTED BOTH ENGINES AND APU FOR SIGNS OF LEAKAGE. CHECKED OIL SERVICE. INSPECTED CABIN FOR SIGNS OF ELECTRICAL SMOKE. NO DEFECTS NOTED. RAN BOTH ENGINES, BOTH PACKS AND APU AT VARIOUS SETTINGS/CONFIGURATIONS. NO SMOKE NOTED ON RUNUP. REF EMB145XR MM 72-00-00 AND 21-20-00.