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The investigation considered that the intermittent deterioration in cabin air quality was consistent with other similar occurrences during which the cabin air was contaminated by engine or APU lubricating oil. Due to the intermittent nature of contamination the source of the fumes was difficult to positively identify.

It was not possible to identify the substance(s) that had apparently contaminated the crew's drinking water while it had been left standing in the cups. However, the investigation could not discount the possibility that the drinking water had been contaminated by water-soluble compounds from cabin air contaminated by engine lubricating oil.

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