What was found
SMOKE/MORE LIKE ELECTRICAL FUMES/CABIN & FLIGHT DECK. RECIRCULATION (GASPER) FAN PLACED IN OFF POSITION. QUICK REFERENCE HANDBOOK COMPLETED, FUMES SUBSIDING. CHECKED SYS PER MM 21-00-01. ALL SYSTEMS CHECK OK, INCLUDING "RECIRCULATION" GASPER FAN. NO FUMES NOTED. SIX SEGMENTS FLOWN, APX. 9 HRS FLT TIME. GASPER FAN INOPERATIVE. REPLACED GASPER FAN PER MM 21-42-21. UPON REMOVAL, VERBALLY CONFIRMED BY MX THAT THE BEARINGS IN THE GASPER FAN MOTOR WERE ROUGH & BINDING. THE GASPER FAN IS PRESENTLY BEING PROCESSED INTO REPAIR SHOP WITH A TEAR DOWN REPORT FORTHCOMING. RECEIVED THE TEAR DOWN REPORT: FAN WAS DIRTY, BEARINGS WERE WORN TO FAILURE CAUSING IMPELLER TO RUB THE INLET SHROUD. ROTOR RUBBED THE STATOR.