What was found
LT PITOT HEAT PROBLEM. DUE TO HEAT PITOT FAULT SWAP THE PITOT ADM C AND L MODULES FOR TROUBLESHOOTING. AFTER SWAP ACCOMPLISHED IAW AMM. CONFIRMED L PITOT AIRDATA MODULE AT FAULT. MSG FOLLOW TO CTR (HEAT PITOT C) ADM L SN 01092556 IN CTR POSITION. ADM C SN 01102575 IN LT POSITION. REPLACED LT PITOT AIR DATA MODULE (ADM) IAW AMM. MESSAGE CLEARED AND SYS OPERATES NORMAL. DUE MESSAGE DISPLAYED AFTER ENGINES RUN, AS PRECAUTION RUN BOTH ENGINES. NO MESSAGES REPEATED.