What was found
AIR TURNBACK, SMOKE IN CABIN. CABIN SMELLED OF SMOKE AFTER DEPARTURE. SUSPECT SMELL CAME FROM RT PACK. AIR RETURNED TO ICT. MAINTENANCE INSPECTED RT PACK TURBINE OIL QTY AND WATER SEPARATOR, CHECKED NORMAL. DEACTIVATED RT PACK IAW MEL 21-01. DEFERRED PLACARD 21-01 ISSUED PER MAINT CONTROL. MX REACTIVATED RT PACK, RAN PACK OFF ENGINE BLEED AND NO SMELL OR SMOKE NOTED AT THIS TIME. COULD NOT DUPLICATE, OPS NORMAL.