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Unfortunately I don't have the answer here but I'm curiously awaiting someone that does to respond.
Is your friend a pilot or adventure seekers who actually used this piece? Either way, in his shoes I would consult with a Breitling service centre to see what they say. From my experience as a Breitling owner they've been very good to me when ever I had questions.
For me, even if I was just a collector that didn't use the function it would still be in my best interest to make sure all is working as it should. I'm sure there's a chance it could be a very simple thing with an easy resolution but time will tell.
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