What was found
SEA - HAZE APPEARED IN THE CABIN WITH NO SMOKE ODOR. IT SEEMED TO SUBSIDE AFTER TURNING OFF NR 1 BLEED. MAINTENANCE REPLACED O-RINGS ON THE NR 1 LP PROBE AND SHIMMED, THE NR 1 P2 VALVE TO 4 SPACERS. DURING GROUND RUN, INSPECTED OIL BREATHER, NO HELP. AIRCRAFT FERRIED FROM SEA TO PDX FOR REPAIRS. IN PDX, REPLACED NR 1 ENGINE. GROUND RUN AND OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. AWITING TEARDOWN ANALYSIS OF REMOVED ENGINE.