What was found
AIRCRAFT 3827, ROTTEN EGG SMELL APPEARED AT THRUST APPLICATION, THEN THROUGHOUT FLIGHT. CORRECTIVE ACTION: INSPECTED APU BLEED DUCTS AND ENG DUCT FOR CONTAMINATION. NTF. INSPECTED DOOR HEATERS. NTF. L+R HYDS LEVELS ARE NML. NO HYD LEAKS FOUND. CHECKED CABIN + COCKPIT, NO ODORS. FOUND FWD CARGO HEAVY PAINT SMELL, ON AFT WALL NEW PAINT. FOUND LT RECIRC FILTER INSTALLED INCORRECT. HAD A 6" GAP. INSTALLED LT +RT FILTERS FOR RECIRC SYSTEM PER B737 AMM 21-25. APPLIED OZONE CONVERTER TO FWD CARGO FOR SEVERAL HOURS. SMELL IS NOW DISSAPPAITED. (LP 4432710)