As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH AIRFOIL ANTI-ICE ON FOR FINAL 5 MINUTES OF FLIGHT SOME VISIBLE SMOKE APPEARED IN CABIN WITH SLIGHT SMOKY SMELL IN COCKPIT. SMELL AND SMOKE DISAPPEARED WHEN AIRFOIL ANTI-ICE AND ENG ANTI-ICE TURNED OFF AND PNEUMATIC CROSS-FEED VALVES WERE CLOSED. FOUND LT REVERSER CONTROL VLV TO ACCUMULATOR LINE LEAKING ALLOWING FLUID TO ENTER APU INLET WHEN RUNNING. REPLACED FITTING AND O-RING. CHECK-C 12-3-00 MCI.