What was found
BEFORE LANDING PILOTS SMELLED A BURNING ODOR IN FLT DECK. UPON LANDING TURNED OFF LIVE TV. ON GROUND PERFORMED TSM TASK 24-00-00-810-823, NO FAULT CONFIRMED. NO C/B TRIPPED OR OTHER EVIDENCE. AFTER RELEASED FOR FLT AIRCRAFT RETURNED TO GATE WITH ODOR IN COCKPIT. T/S PER TSM 24-00-00-810-823. REMOVED EACH DU, INSPECTED AND REINSTALLED DU'S, NO ABNORMALITIES NOTED. REMOVED BOTH MCDU'S, INSPECTED & REINSTALLED. NO ABNORMALITIES NOTED. OPERATED WEATHER RADAR, RAN BOTH ENGINES & PACKS AT FULL HOT THEN FULL COLD FOR 10 MINUTES, NO ABNORMALITIES. INSPECTED AVIONICS BAYS, TAXI AIRCRAFT FOR 25 MINUTES, COULD NOT DUPLICATE ANY ABNORMALITIES. REPLACED F/O'S DU'S AS PRECAUTIONARY. REMOVED DU P/N 3907130402.