What was found
FLT#1193, BOS-MBJ. 'DIRTY SOCK FUME EVENT BEGINNING AT APPROX 25K IN DESCENT ENGINES ABOVE IDLE . BECOME VERY STRONG PASSING 18K PERSISTED UNTIL SHUTDOWN AT THE GATE , COCKPIT AND ENTIRE CABIN NOTED BY ALL CREW MEMBERS. ( PACKS ); COMPLIED WTH INFO NOTICE -2017. LEVEL B DECONTAMINATION PERFORMED . PLACED APU ON MEL REMOVED AND REPLACED APU COOLING FAN IIAW AMM 49-52-00 APU COMPARTMENT CLEANING REQUIRED DECON PER TSM 05-50-ALL CHECKS NORMAL APU COMPARTMENT CLEANING REQUIRED DECON LEVEL B WAS DONE PER TSM 05-50-00-810-831-A. AIRCRAFT IS OK FOR SERVICE.P CARD REMOVED MDDR # CLEARED MX-4 UPDATED.'