This report is being supplemented to provide additional information based on the legal manufacturer final investigation.As stated previously the reported event was confirmed by the dispatched field service engineer.In addition, an investigation was performed by the legal manufacturer based off of the information provided.1.A review of similar complaints both at the specific facility and in general was performed with only a limited number of similar complaints.This will be trended.2.A review of the ifu was performed and it was confirmed the ifu gives instruction to inspect the air filter.3.A review of the dhr was performed and there were no issues found within the record associated to the reported event.4.A review of service records and repair records was performed.No repair information for the past year for the product was observed.Conclusion: a root cause could not be definitively identified.It is probable that the air filter could not be removed due to an abnormality in the sleeves that connects the oer-pro and the air filter.As for the cause of the abnormality in the sleeves, it is possible that the sleeves were damaged due to accumulated stress being applied to the sleeves.
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