As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2231, OBSERVED LARGE PLUME OF BLUE SMOKE FROM THE TAILPIPE OF NR 2 ENGINE WHEN SELECTING NR 2 CONDITION LEVER TO FUEL OFF AFTER 30 SECOND COOL DOWN. ALL ENGINE INDICATIONS NORMAL. MAINTENANCE REPLACED NR 2 ENGINE IAW TASK CARDS 9710003 AND 9710004. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.