What was found
FLT#1575, FLL-KIN. 'LIGHT DIRTY SOCK SMELL FLT DECK IN DESCENT. FA REPORTS ODOR PRESENT MID-CABIN IN DESCENT. WITH APU USE, PRE-BOARDING ENTIRE CABIN HAS MODERATE PUNGENT ODOR. CLEANERS AND GATE AGENTS NOTIFIED. (APU WAS OFF IN DESCENT); C/W INFO NOTICE 2017-T015K. DUE TO APU CAUSE OF CABIN ODOR. APU COOLING FAN PREVIOUSLY FOUND LEAKING AND WAS REMOVED AND REPLACED. PERFORMED APU WASH CLEANING. LEVEL A DECONTAMINATION ACCOMPLISHED PER TSM 05-50-00-810-831-A. AIRCRAFT IS OK FOR CONT SERVICE. NO ODOR PRESENT AT THIS TIME.