As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORT RUBBER OR PLASTIC LIKE BURNING ODOR COMING FROM NEAR DOOR 2L . NO VISIBLE SMOKE. DURING DECENT ODOR SEEMED TO COME AND GO INTERMITTENTLY. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. REPLACED APU OIL COOLING FAN AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 49-52-51.