As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. BURNING RUBBER ODOR IN CABIN FROM ROW 3 TO AFT GALLEY STRONG DOOR, QUICKLY SHUT OFF IFE SYS NO ODOR FOR 2 HOURS. ODOR RETURNED VERY STRONG SHUT OFF BOTH UTILITY BUSES & BOTH RECIRCULATION FANS IAW QRH, NO FURTHER PROBLEM NO EICAS MSGS. FOUND THE RT RECIRCULATION FAN SEIZED. REPLACED FAN & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 21-25-01.