To be fair, it turned out it was coming from the pipe flange at the top, you can see it beneath that lower bolt head.
All that technology and it's a £3 O-ring that lets it down.
Actually, knowing Aircraft parts prices, it's probably more like a £20 O-ring
I moan about car part prices, but you wouldn't believe what some things cost.
I worked in one of the Engine shops for a while when I was an Apprentice, we used to try and find the most expensive parts (for their size) in the parts catalogue.
I think I won, with about £12,000 for a 12" diameter ball-race :shakehead:
And that was around 1980...