What was found
RED "COCKPIT DUCT TEMP HI" ANNUCIATED AT LIFTOFF. VERY HOT IN COCKPIT & CABIN. SMOKE IN COCKPIT & CABIN. DECLARED EMERGENCY, SELECTED MANUAL. ANNUCIATOR EXTINGUISHED, COCKPIT COOLED DOWN & SMOKE DISIPATED 15-20 SECS AFTER SELECTING MANUAL. AFTER LANDING, BLACK SMOKE STAINS EVIDENT ABOVE VENTS BETWEEN COCKPIT SEATS & SIDEWALL ON BOTH SIDES. ARFF INFARED HEAT DETECTOR ALSO INDICATED HOT DUCTS IN CABIN ALONG FLOOR ON BOTH SIDES. TROUBLESHOT SYSTEM & REPLACED DUCT TEMP SENSOR WITH AN INSPECTION UNIT. REPLACED COCKPIT SENSOR WITH NEW UNIT. PERFORMED GOOD TEMP CONTROL SYS FUNCTIONAL CHECK REF CMP 210036 & MM 21-60-00. ORIGINAL SQUAWK NOT RESOLVED. R&R PRSOV (RT) WITH REPAIRED UNIT. OPS CHECK GOOD. BUT ORIGINAL SQUAWK NOT RESOLVED. REF CMP 213102. CONTINUED TROUBLESHOOTING. FOUND EMERGENCY AIR VALVE NOT CLOSING COMPLETELY. R&R EMER AIR VALVE WITH AN OVERHAULED UNIT. REMOVED COCKPIT DUCT TEMP SENSOR & INSTALLED INSPECTED SENSOR. REMOVED COCKPIT TEMP SENSOR & INSTALLED NEW TEMP SENSOR. PERFORMED LEAK & OPS CHECK PER MM 21-80-01 AND CMP 216301, 210023, 210036. REPLACED RT PRSOV WITH REPAIRED PRSOV PER MM 21-20-04 AND CMP 213102. REPLACED EMERGENCY AIR VALVE WITH OVERHAULED VALVE . OPS CHECK GOOD. INSTALLED REPAIRED PRSOV VALVE, INSTALLED GASKET. [ORIGINAL SUBMISSION DATE OF SDR: 4/27/2009. ADP]