What was found
STL - FLT 409 - AFTER TAKEOFF, A NOTICEABLE SMOKE AND ODOR APPEARED IN CABIN, DISSIPATED DURING CLIMB. FOUND APU, MFG PN 381276-1, LEAKING OIL INTO AIR CONDITIONING SYSTEM. PLACARDED APU INOPERATIVE. PER THE MINIMUM EQUIPMENT AND DISPATCH PROCEDURES MANUAL, 49-1. CHECK C-1D - 1-395 - MCI.