Observation show they are quite a number of rubber bend hose with clamp piping from Air filters housing till turbo inlet and to ATTAC and back to engine cylinder. This area will need to be check often for clamp loose during daily operation and maintenance practices due to a dusty working environment. From the air filters elements it show very heavy dust accumulation it should be clean often or replaced. And care has to be taken to ensure elements sealing must be effective. We do came across issues when elements had seat properly during re-install elements after cleaning.