What was found
MIXTURE CONTROL CABLE, OVER A 6-MONTH PERIOD, BECAME INCREASINGLY DIFFICULT TO MOVE. LUBRICATION TEMPORARILY RESOLVED PROBLEM, ONLY TO RETURN. FIRE STOP INSULATION SHEATH ALONG WITH NEW MIXTURE CABLE INSTALLED BY A & P. PROBLEM RESOLVED. SUSPECT CAUSE AS EXCESSIVE HEAT FROM TURBOCHARGER, UNSHIELDED, CAUSED CORROSION TO OCCUR INSIDE CABLE HOUSING. RECOMMENDATION: INSTALL NEW CABLE WITH FIRE SHIELD.