What was found
FLT#1075, PVD-MCO. ' DESCENT FROM FL 350, AT FL230 DOWN TO 13000 WE HAD ODOR SMELL OF CHEMICAL, WET BURNT WOOD. HP VALVES OPEN CABIN FWD/AFT ALSO HAD A SMELL ON THE GROUND AFTER LANDING SINGLE ENG APU ON BLEED. IT SMELLS AGIN BUT MORE OF BURT PLASTIC; COMPLIED WITH INFORMATION NOTICE 2017-T015, SECTION B2 DECONTAMINATION LEVEL B WAS ACCOMPLISHED PER TSM 05-50-00-810-831-A. AIRCRAFT IS OK FOR SERVICE.'