What was found
DURING DESCENT A PUFF OF SMOKE FOLLOWED BY WHAT APPEARED TO BE TINY METALLIC PIECES CAME OUT OF FIRST OFFICERS SIDE AIR GASPER. CLEAR BURNING SMELL, ALSO NOTED FOR ABOUT A MINUTE. ENGS WERE APPROX 60% N1. LT PAC PLACED ON DEFERRAL IAW MEL 21-51-01B CATEGORY C JCN 3182584-1. PLACARD INSTALLED, COMPLIED WITH PROCEDURES, MX NOTIFIED & ENTERED IN MMO2. R & R LT ACM IAW AMM 21-51-08. LEAKS & OPERATIONS TESTED GOOD AT THIS TIME. REMOVED FROM MMO2 & MX NOTIFIED. THIS CLEARED MEL.