What was found
AFTER LIFTOFF ON KMEM 18L, HEAVY ARID FUMES FILLED COCKPIT FOLLOWED MAY RED MAIN DECK SMOKE WARNING AND CRC CHIMES. DECLARED EMERGENCY AND LANDED ON RUNWAY 27. FUMES STILL HEAVY. EVACUATED AIRCRAFT ON RUNWAY. RAN PACKS ON GROUND. NOTED THE ODOR OF OIL WHILE PACKS ARE RUNNING WITH APU AIR INSP DUCT AT THE OUTLET SIDE OF APU LOAD BLEED VALVE. NO OIL NOTED. REINSTALLED DUCT AND CLAMP. RAN APU. LEAK CHECK GOOD. REMOVED AND REPLACED AVIONICS COOLING AIR FILTER AS PRECAUTIONARY PER SMP. REPLACED COALESCER BAGS (PRECAUTIONARY). PERFORMED ENG RUNS AT PWR PER A310 JRH. NO ODOR NOTED DURING ENG RUNS. NO DEFECTS NOTED AT THIS TIME REINSTALLED PACK BAY PANEL PER SMP.