What was found
AIRCRAFT GROUNDED: FLIGHT CREW REPORTED DURING CRUISE, SMELLED A HOT ODOR WHICH DISSIPATED. LT PACK RAN AWAY TO 200 F. & CONTROLLED CABIN DUCT REACHED 175. FOLLOWED BY LT PACK LIGHT ILLUMINATING. FLT CREW ACCOMPLISHED CABIN TEMP HOT QRH PROCEDURE & TURNING LT PACK OFF WHICH RESULTED IN FLT DECK COOLING DOWN. MAINT ACCOMPLISHED SMOKE ODOR FUMES TROUBLESHOOTING TASK CARD 08L00021001 & FOUND LT PACK THE CAUSE OF ODOR DURING OPS TO COLD SETTING. MAINT REPLACED THE LT ACM, WHICH WAS FOUND TO BE FROZEN IAW AMM 21-51-04, LT PACK TEMP CONTROL VALVE PER AMM 21-51-10 AND LT FLOW CONTROL VALVE / SHUTOFF VALVE PER AMM 21-51-01. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS OR DEFECTS NOTED.