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That being said, this one is fishy. I've seen the 21.3 report, and it doesn't make LOT maintenance look good (sorry, I can't elaborate). It's possible that the aircraft was delivered w/o filters, but it is also possible they were removed but not replaced by LOT prior to the event.
Are you making this up, or did this 'secret report' fail to realize that LOT don't maintain the 787, which again falls within Boeing responsibility as Monarch are approved by Boeing?
21.3 reports are considered proprietary - but I don't think there is any place in the Boeing approved maintenance procedures that would allow maintenance to clear a no-dispatch fault - without doing any maintenance or troubleshooting - and dispatching the airplane.