I remember it well at SEN and it was the first time my children had seen a wet start with the the flaming engines start. The a/c was hangared for a couple of weeks with Heavylift Eng and was also resprayed so the costs would have been significant. I was told recently that it had been grounded in Saudi. If it is still flying it is some credit to the old 707.
Of interest to me is what has happened to the Koda Air 707 which I believe is also a '9L'.