What was found
MUSTY MILDEW ODOR DURING CLIMB OUT, PASSING THROUGH CLOUDS BUT THEN DISAPATED. POSSIBLY DURING CRUISE AGAIN. BUT STRONG DURING DESENT WHEN PASSING THROUGH CLOUDS. PERFORMED POST-WASH BORESCOPE INSPECTION ON NR 1 & 2 ENGINES, LPC STAGE 2.5 IAW AMM 72-00-00-200-1A. FOUND NO OIL PUDDLING OR ACTIVE LEAKS. PERFORMED CABIN ODOR IDENTIFICATION INSPECTION TSM 05-50-00-810-831-A. FOLLOWED INFO NOTICE 2017-T015A. CONFIRMED PACK 2 AT FAULT. ACCOMPLISHED TSM PROCEDURE WITH ASSITANCE OF FLIGHT CREW FOR ENG FAULT ISOLATION. PACK 2 REQUIRED DEACTIVATION, COMPLIED W/INFO NOTICE 2017-T015A SECTION C. A/C IS OK FOR SVC. MDDR CLEARED MX-4 UPDATED PLACARD REMOVED MCC NOTIFIED.