What was found
FLT#1252, CUN-JFK. 'DURING DESCENT AT 10,000 FT WITH ENGINE BLEED SOURCE FLT CREW ONLY DETECTED A LEVEL 1 TRANSIENT (ELECTRIC PLASTIC) BURNS TYPE ODOR, LASTED ABOUT 4 MINS. ON THE GROUND WITH A CHANGEOVER TO APU BLEED SOURCE A SHORT LEVEL 1 TYPE (DIRTY SOCK) SMELL ODOR LASTED ABOUT 3 MINS. INFLIGHT CREW AND CUSTOMERS SAID NOTHING WAS OBSERVED. ON THE FLIGHT TO CUN NOTHING WAS DETECTED EVEN THE MOISTURE LATCH ENVIRONMENT. THE ONLY DIFFERENCE ON DESCENT WAS LANDING IN CUN, CABIN TEMP KNOBS WERE SLOWLY PLACED IN FULL COLD TO 30 C+ TEMPS. AT JFK CABIN TEMP ZACS WERE AS FOLLOWED. FLIGHT DECK 11 'O'CLOCK, FWD /AFT CABIN 9'/9 'O'CLOCK FOR BOTH. ( APU SYSTEM ). (SUPPLEMENTAL INFORMATION TO FOLLOW)