As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1796, CUN-FLL. INFLIGHT REPORTED A CHEMICAL OR FUME-TYPE SMELL. IT WAS INTERMITTENT ON GROUND AND ON DESCENT AT 6000 MSL AT LEAST 3 SEPARATE TIMES ; PERFORMED INSPECTION IAW INFO NOTICE 2017-T015I. FOUND EVIDENCE OF APU OIL LEAK AND SOURCE OF ODOR EVENT. RAN ENGINES 1 + 2. NO ODOR PRESENT. APU PLACED ON MEL REF L/P 3295513-2(SUPPLEMENTAL INFORMATION TO FOLLOW)