As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT # 2011, JFK-TPA(AIR RETURN BACK). ODOR / SMOKE EVENT; VERIFIED ODOR EVENT TO HAVE BEEN CAUSED BY LH PACK ACM BECOMING SEIZED. LT PACK WAS PLACED ON MEL 21-51-01A ON L/P 4541991-2 ACCOMPLISHED ENG 1+ 2 RUNS TO VERIFY NO ODOR IN AIR SYSTEM PER AMP 71-00-00 RAN APU PER AMP 49-00-00, NO ODOR PRESENT AT THIS TIME. OK FOR CONT SVC (SUPPLEMENTAL INFORMATION TO FOLLOW)