What was found
DURING CRUISE. TURNED UP COCKPIT HEAT, IMMEDIATELY GOT AN ODOR OF HOT DUCTING IN COCKPIT. TURNED HOT DOWN &ODOR SEEMED TO DISSIPATE. PERFORMED ELIMINATION OF ODOR IN FLT DECK/CABIN. PACK 1 SUSPECTED. TURNED OFF PACK 1 IAW QRL, NO ODOR DETECTED. LT PACK OFF FOR REMAINDER OF FLT. FAS REPORTED NO ODOR DETECTED, FWD CABIN, AFT FAS THOUGHT THEY COULD SMELL SOMETHING HOT. IAW TSM 05-50-00-810-831-A IDENTIFICATION THE CAUSE FOR CABIN ODOR, SMOKE OR FUME. TYPE 5 & 6. C/W LEVEL A BURNOUT WITH APU C/W. ON 01-19-2023 CHANGED BOTH PRIMARY & MAIN HEAT EXCHANGERS ON BOTH RT & LT PACKS. R & R BOTH RECIRCULATION FILTERS. RAN PACKS FOR 30 MINS FULL HOT. NO ODORS NOTED. IAW AMM 21-21-41-400-001-A AND 21-21-41-000-001-A.