As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG BURNING PLASTIC ODOR BETWEEN ROWS 25-35, ODOR STRONGEST ON RIGHT OF ACFT. COMPLETED NNC8.5 1-9 CONTINUED FLIGHT WITHOUT FURTHER OCCURANCE. R & R ZONE TRIM "C" VALVE IAW MAINT, MESSAGE 21-20009 IAW AMM 21-61 RAN ALL PACKS AT VARIOUS TEMPS FOR APPROX 2 HRS, NO ODOR NOTED. OPS CHECKED NORMAL IAW AMM 21-61 ALL DUCT TEMPS , CABIN TEMPS AND PACK TEMPS NORMAL.