What was found
AT CRUISE 19,000 SMELLED SMOKE ODOR WITH NO VISIBLE SMOKE IN COCKPIT - F/A'S DID NO ODOR. NO ABNORMAL INDICATIONS IN COCKPIT. COMPLETED AIR CONTAMINATION CHECKLIST FORM M-744. PERFORMED GVI OF COCKPIT, FWD CABIN, LAVAORY AND FWD BAGGAGE COMPARTMENT. NO DEFECTS NOTED. CHECKED NR 1 AND NR 2 ENGINE OIL QUANTITY. NO DEFECTS NOTED. C/W REMOVAL OF ODOUR FROM AIR CONDITIONING DUCTS IAW AMM TASK 21-00-00-160-801. RAN APU WITH BLEED AIR SELECTED ON AND RECURIC FAN SELECTED ON FOR 20 MINUTES. NO ABNORMAL ODORS NOTED. GROUND RAN BOTH ENGINES, BLEED 1 AND 2 SELECTED ON, RECURIC FAN SELECTED ON, PACKS IN AUTO. RAN ENGINES FOR APPROX 25 MINUTES AT VARIOUS POWER SETTINGS FROM DISC TO RATING. NO ABNORMAL ODORS NOTED. RETURNED TO SERVICE.