As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, CREW REPORTED HEARING A LOUD THUMPING SOUND FROM THE LEFT SIDE OF THE AIRCRAFT, ASSOCIATED WITH THE AIRCRAFT SLOWING ALMOST TO A STOP. CREW ELECTED TO SHUT DOWN BOTH ENGINES AND CALL MX. UPON ARRIVING AT THE AIRCRAFT, MX NOTICED THAT THE LEFT OUTBOARD MAIN LANDING GEAR TIRE WAS FLAT. MX REPLACED THE LEFT MAIN LANGING GEAR TIRE/WHEEL ASSEMBLY IAW MM 32-40-00.