What was found
(AIRCRAFT 682, L/P 5961487) FLIGHT DECK TEMPERATURE FLUCTUTED BETWEEN FULL HOT AND FULL COLD WITH ASSOCIATED BURNING ODOR WHEN HOT. TURNING OFF FLIGHT DECK AUTO CONTROL AND RUNNING L PACK IN STBY W MODE WAS ONLY WAY TO MAINTAIN ADEQUATE TEMPERATURE. CORRECTIVE ACTION: R/R FLIGHT DECK TRIM VALVE PER B757 AMM 21-62. R/R CABIN ZONE TEMP CONTROLLER PER B757 AMM 21-62. TRIM VALVE STILL OSCILLATES. R/R COCKPIT TEMP CONTROL SENSOR AND TEMP BULB PER B757 AMM 21-61. CLOSED ALL ACCESS PANELS IN FWD CARGO COMP.