What was found
RED EICAS WARNING CAME ON FOR A SECOND WITH THE BELL. WE WERE UNABLE TO READ WHAT THE WARNING WAS. WHEN I OPENED THE FLIGHT DECK CARGO ACCESS DOOR, I SAW WHITE BILLOWING SMOKE (NOT CONDENSATION) & DECLARED AN EMERGENCY(<P>UPON BLOCK IN OF A/C, NO INDICATIONS OF SMOKE DETECTION SYSTEM PRESENT. NO SMOKE PRESENT IN CARGO AREA. NO SCENT OF SMOKE OR BURNING PRESENT. REMOVED ALL CANS FROM A/C. INSPECTED ALL CARGO AREAS & ALL CANS. NO EVIDENCE OF FOUND IN CARGO AREAS OR ANY CANS. C/W AMM TASK 05-51-56-202-001 NO SMOKE OR FUMES IN CABIN, CONDITIONAL INSPECTION TASK 21-00-21-102-030 REMOVAL OF OIL FROM PNEUMATIC SYSTEM. NO OIL FOUND. NO OTHER DEFECTS NOTED. PERFORMED IDLE RUNS ON #1 AND #2 PER AMM 71-00-00 TO FACILITATE AMM TASK 21-00-21.</P>)