What was found
FLT 503, JFK-SJU. ODOR DETECTED DURING DESCENT BELOW 10,000. CONFIRMED WITH CABIN CREW. LOCATION OVERWING EXITS STRONGEST, AND FWD. LASTED A MINUTE THEN DISSAPATED. FOUL HEATED PLASTIC TYPE ODOR, FOLLOWED INFO NOTICE 2017-T015L WITH MX-270 PROVIDED. TSM 05-50-00-810-085-B FAULT ISOLATION FOR TYPE 1 LEVEL A. NO LEAKS FOUND DURING ULTRA VIOLET LIGHT INSP. APU WORKING PROPERLY. IAW AMM 49-00-00-200-812-A ACFT OK TO CONT SVC. NO ODOR PRESENT AT THIS TIME.