®i©ardo a émis l'idée suivante :

;oD
starting vacation

Before you do, does this help?

Inside the "hole", I see a central smaller darker disk (hole?) with 8
other similar disks all around. But the elevator still looks OK to my
eyes. I made again a negative picture to confirm I see the same. It
looks shaped like in the detail picture sent by D.520.

The initial picture is taken from rear under. The horn is shaped like
half a bulb, so maybe it's a matter of perspective and how 3D curves
are seen with this angle of sight. Or the "problem" may be in colors,
sky grey vs. camo grey with a brighter area of the bulb, better
reflecting the daylight.
Really I don't know. But it keeps looking OK to me despite my efforts
to find twisted things.