What was found
AFTER TAKEOFF FLT ATTENDANT REPORTED SMOKE IN CABIN. FLT CREW COMPLIED WITH COM PROCEDURES FOR SMOKE REMOVAL & INITIATED A RETURN. PILOTS NOTED RT AC SYS INDICATING FULL HOT IN AUTOMATIC MODE, TRIED FULL COLD IN AUTO MODE. VALVE POSITION REMAINED IN FULL HOT UNTIL CREW SELECTED FULL COLD IN MANUAL MODE, & SMOKE & HEAT SOON DISSIPATED. ATB LANDING UNEVENTFUL. MX INSPECTED ALL POSSIBLE OIL LEAK SOURCES, FOUND MINIMAL RESIDUE. REPLACED WATER SEPARATOR SOCKS & CABIN TEMP CONTROLLER (AT A2-5) & ACCOMPLISHED PACK BURNOUT PROCEDURES. COALESCER BAGS WERE SPECIFICALLY DESCRIBED AS DIRTY BUT NOT OIL SOAKED. AFTER PACK BURNOUT PROCEDURES COMPLETED & NO OTHER EVIDENCE OF SMOKE NOTED, ACFT RETURNED TO SERVICE.