What was found
BURNING PLASTIC SMELL AT T/O FOR 5 TO 10 MIN. CLEARED AFTER DESELECTING RECIRCS AND VENTING CABIN. ON DESCENT AND POWER REDUCTION TO IDLE AT 41000 HAD STRONG SMELL AND LIGHT BLUE HAZE THROUGHOUT CABIN AND COCKPIT. ALL LAV SMOKE ALARMS WENT OFF AND REPEATED SMOKE AND FUME CLEARING PROCEDURE WHILE DIVERTING MOST OF SMOKE CLEARED BY LANDING. FOUND NO ABNORMAL EICAS OR LIGHTS AT ANY TIME. *S/D* THE NUMBER 1 AND 2 BEARING CARBON SEAL FACES WERE FOUND WORN. THE SEALS WERE REPLACED AND THE ENGINE WAS RUN IN THE TEST CELL USING A FILTER SYSTEM ON THE BLEED AIR SUPPLY. NO OIL RESIDUE WAS DETECTED IN THE FILTER AFTER EXTENSIVE TESTING. THIS ENGINE HAS SUBSEQUENTLY OPERATED ON ANOTHER AIRCRAFT FOR APPROXIMATELY 6