What was found
PER VERBAL FROM CREW: UNABLE TO HEAT FLIGHT DECK.WARMEST TEMP IS 52 DEGREES WITH SELECTOR IN FULL WARM IN BOTH AUTO AND MANUAL MODE. TRIED AC RESET-NO HELP. NON FLYING FLIGHT CREW NOTICED SLIGHT NOISE/VIBRATION AT FLOOR AT ROW 9. CREW REPORTS THAT SYNOPTIC PAGE SHOWS FD TRIM AIR VALVE AT FULL (W). CHECK FD TRIM AIR DUCTING REF AMM 21-61-02. REMOVED & REPLACED DAMAGED LH AIR DUCT REF IPC 21-52-51-08 ITEM 240 M&E 27-2152-3-0028. NO LEAKS NOTED. RAN BOTH ENGINS AND PACK SYSTEM TO VERFIFY THAT COCKPIT HEATS UP NICELY.