As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OVERWEIGHT LANDING STRONG BURNING PLASTIC SMELL OR SIMILAR ODOR STOPPED FOR 5 MIN. THEN RETURNED. FOUND ODOR TO BE COMING FROM RECIRC FAN. P6-4 PANEL C/B E4 BREAKER ALSO TRIPPED FOR CABIN AIR FAN. R&R RECIRCULATION FAN.OPS CHECK GOOD, LEAK CHECK GOOD. RESTORED A/C TO NORMAL.